| slovo | definícia |
H2O
(gcide) | H2O \H2O\ n. ([=a]ch`t[=oo]`[=o]"),
The chemical formula for water.
Syn: water, hydrogen oxide.
[WordNet 1.5] |
H2O
(gcide) | Molecular \Mo*lec"u*lar\, a. [Cf. F. mol['e]culare. See
Molecule.] (Phys. & Chem.)
Pertaining to, connected with, produced by, or consisting of,
molecules; as, molecular forces; molecular groups of atoms,
etc.
[1913 Webster]
Molecular attraction (Phys.), attraction acting between the
molecules of bodies, and at insensible distances.
Molecular weight (Chem.), the weight of a molecule of any
gas or vapor as compared with the hydrogen atom having
weight of 1 as a standard; the sum of the atomic weights
of the constituents of a molecule; thus, the molecular
weight of water (H2O) is 18. For more precise
measurements, the weight of the carbon isotope carbon-12
is used as the standard, that isotope having the value of
12.000. In this systen, now used almost universally, the
hydrogen atom has a weight of 1.0079.
[1913 Webster +PJC] |
H2O
(gcide) | Type \Type\ (t[imac]p), n. [F. type; cf. It. tipo, from L. typus
a figure, image, a form, type, character, Gr. ty`pos the mark
of a blow, impression, form of character, model, from the
root of ty`ptein to beat, strike; cf. Skr. tup to hurt.]
1. The mark or impression of something; stamp; impressed
sign; emblem.
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The faith they have in tennis, and tall stockings,
Short blistered breeches, and those types of travel.
--Shak.
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2. Form or character impressed; style; semblance.
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Thy father bears the type of king of Naples. --Shak.
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3. A figure or representation of something to come; a token;
a sign; a symbol; -- correlative to antitype.
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A type is no longer a type when the thing typified
comes to be actually exhibited. --South.
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4. That which possesses or exemplifies characteristic
qualities; the representative. Specifically:
(a) (Biol.) A general form or structure common to a number
of individuals; hence, the ideal representation of a
species, genus, or other group, combining the
essential characteristics; an animal or plant
possessing or exemplifying the essential
characteristics of a species, genus, or other group.
Also, a group or division of animals having a certain
typical or characteristic structure of body maintained
within the group.
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Since the time of Cuvier and Baer . . . the
whole animal kingdom has been universally held
to be divisible into a small number of main
divisions or types. --Haeckel.
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(b) (Fine Arts) The original object, or class of objects,
scene, face, or conception, which becomes the subject
of a copy; esp., the design on the face of a medal or
a coin.
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(c) (Chem.) A simple compound, used as a model or pattern
to which other compounds are conveniently regarded as
being related, and from which they may be actually or
theoretically derived.
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Note: The fundamental types used to express the simplest and
most essential chemical relations are hydrochloric
acid, HCl; water, H2O; ammonia, NH3; and methane,
CH4.
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5. (Typog.)
(a) A raised letter, figure, accent, or other character,
cast in metal or cut in wood, used in printing.
(b) Such letters or characters, in general, or the whole
quantity of them used in printing, spoken of
collectively; any number or mass of such letters or
characters, however disposed.
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Note: Type are mostly made by casting type metal in a mold,
though some of the larger sizes are made from maple,
mahogany, or boxwood. In the cut, a is the body; b, the
face, or part from which the impression is taken; c,
the shoulder, or top of the body; d, the nick
(sometimes two or more are made), designed to assist
the compositor in distinguishing the bottom of the face
from t`e top; e, the groove made in the process of
finishing, -- each type as cast having attached to the
bottom of the body a jet, or small piece of metal
(formed by the surplus metal poured into the mold),
which, when broken off, leaves a roughness that
requires to be removed. The fine lines at the top and
bottom of a letter are technically called ceriphs, and
when part of the face projects over the body, as in the
letter f, the projection is called a kern.
[1913 Webster] The type which compose an ordinary book
font consist of Roman CAPITALS, small capitals, and
lower-case letters, and Italic CAPITALS and lower-case
letters, with accompanying figures, points, and
reference marks, -- in all about two hundred
characters. Including the various modern styles of
fancy type, some three or four hundred varieties of
face are made. Besides the ordinary Roman and Italic,
some of the most important of the varieties are
[1913 Webster] Old English. Black Letter. Old Style.
French Elzevir. Boldface. Antique. Clarendon. Gothic.
Typewriter. Script.
[1913 Webster] The smallest body in common use is
diamond; then follow in order of size, pearl, agate,
nonpareil, minion, brevier, bourgeois (or two-line
diamond), long primer (or two-line pearl), small pica
(or two-line agate), pica (or two-line nonpareil),
English (or two-line minion), Columbian (or two-line
brevier), great primer (or two-line bourgeois), paragon
(or two-line long primer), double small pica (or
two-line small pica), double pica (or two-line pica),
double English (or two-line English), double great
primer (or two-line great primer), double paragon (or
two-line paragon), canon (or two-line double pica).
Above this, the sizes are called five-line pica,
six-line pica, seven-line pica, and so on, being made
mostly of wood. The following alphabets show the
different sizes up to great primer.
[1913 Webster] Brilliant . . abcdefghijklmnopqrstuvwxyz
Diamond . . abcdefghijklmnopqrstuvwxyz Pearl . . .
abcdefghijklmnopqrstuvwxyz Agate . . .
abcdefghijklmnopqrstuvwxyz Nonpareil . . .
abcdefghijklmnopqrstuvwxyz Minion . . .
abcdefghijklmnopqrstuvwxyz Brevier . . .
abcdefghijklmnopqrstuvwxyz Bourgeois . .
abcdefghijklmnopqrstuvwxyz Long primer . . .
abcdefghijklmnopqrstuvwxyz Small pica . .
abcdefghijklmnopqrstuvwxyz Pica . . . . .
abcdefghijklmnopqrstuvwxyz English . . .
abcdefghijklmnopqrstuvwxyz Columbian . . .
abcdefghijklmnopqrstuvwxyz Great primer . . .
abcdefghijklmnopqrstuvwxyz
[1913 Webster] The foregoing account is conformed to
the designations made use of by American type founders,
but is substantially correct for England. Agate,
however, is called ruby, in England, where, also, a
size intermediate between nonpareil and minion is
employed, called emerald.
[1913 Webster]
Point system of type bodies (Type Founding), a system
adopted by the type founders of the United States by which
the various sizes of type have been so modified and
changed that each size bears an exact proportional
relation to every other size. The system is a modification
of a French system, and is based on the pica body. This
pica body is divided into twelfths, which are termed
"points," and every type body consist of a given number of
these points. Many of the type founders indicate the new
sizes of type by the number of points, and the old names
are gradually being done away with. By the point system
type founders cast type of a uniform size and height,
whereas formerly fonts of pica or other type made by
different founders would often vary slightly so that they
could not be used together. There are no type in actual
use corresponding to the smaller theoretical sizes of the
point system. In some cases, as in that of ruby, the term
used designates a different size from that heretofore so
called.
[1913 Webster] 1 American 9 Bourgeois [bar] [bar] 11/2
German [bar] 2 Saxon 10 Long Primer [bar] [bar] 21/2 Norse
[bar] 3 Brilliant 11 Small Pica [bar] [bar] 31/2 Ruby 12
Pica [bar] [bar] 4 Excelsior [bar] 41/2 Diamond 14 English
[bar] [bar] 5 Pearl 16 Columbian [bar] [bar] 51/2 Agate
[bar] 6 Nonpareil 18 Great Primer [bar] [bar] 7 Minion
[bar] 8 Brevier 20 Paragon [bar] [bar] Diagram of the
"points" by which sizes of Type are graduated in the
"Point System".
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Type founder, one who casts or manufacture type.
Type foundry, Type foundery, a place for the manufacture
of type.
Type metal, an alloy used in making type, stereotype
plates, etc., and in backing up electrotype plates. It
consists essentially of lead and antimony, often with a
little tin, nickel, or copper.
Type wheel, a wheel having raised letters or characters on
its periphery, and used in typewriters, printing
telegraphs, etc.
Unity of type (Biol.), that fundamental agreement in
structure which is seen in organic beings of the same
class, and is quite independent of their habits of life.
--Darwin.
[1913 Webster] |
H2O
(gcide) | Water \Wa"ter\ (w[add]"t[~e]r), n. [AS. w[ae]ter; akin to OS.
watar, OFries. wetir, weter, LG. & D. water, G. wasser, OHG.
wazzar, Icel. vatn, Sw. vatten, Dan. vand, Goth. wat[=o], O.
Slav. & Russ. voda, Gr. 'y`dwr, Skr. udan water, ud to wet,
and perhaps to L. unda wave. [root]137. Cf. Dropsy,
Hydra, Otter, Wet, Whisky.]
1. The fluid which descends from the clouds in rain, and
which forms rivers, lakes, seas, etc. "We will drink
water." --Shak. "Powers of fire, air, water, and earth."
--Milton.
[1913 Webster]
Note: Pure water consists of hydrogen and oxygen, H2O, and
is a colorless, odorless, tasteless, transparent
liquid, which is very slightly compressible. At its
maximum density, 39[deg] Fahr. or 4[deg] C., it is the
standard for specific gravities, one cubic centimeter
weighing one gram. It freezes at 32[deg] Fahr. or
0[deg] C. and boils at 212[deg] Fahr. or 100[deg] C.
(see Ice, Steam). It is the most important natural
solvent, and is frequently impregnated with foreign
matter which is mostly removed by distillation; hence,
rain water is nearly pure. It is an important
ingredient in the tissue of animals and plants, the
human body containing about two thirds its weight of
water.
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2. A body of water, standing or flowing; a lake, river, or
other collection of water.
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Remembering he had passed over a small water a poor
scholar when first coming to the university, he
kneeled. --Fuller.
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3. Any liquid secretion, humor, or the like, resembling
water; esp., the urine.
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4. (Pharm.) A solution in water of a gaseous or readily
volatile substance; as, ammonia water. --U. S. Pharm.
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5. The limpidity and luster of a precious stone, especially a
diamond; as, a diamond of the first water, that is,
perfectly pure and transparent. Hence, of the first water,
that is, of the first excellence.
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6. A wavy, lustrous pattern or decoration such as is imparted
to linen, silk, metals, etc. See Water, v. t., 3,
Damask, v. t., and Damaskeen.
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7. An addition to the shares representing the capital of a
stock company so that the aggregate par value of the
shares is increased while their value for investment is
diminished, or "diluted." [Brokers' Cant]
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Note: Water is often used adjectively and in the formation of
many self-explaining compounds; as, water drainage;
water gauge, or water-gauge; waterfowl, water-fowl, or
water fowl; water-beaten; water-borne, water-circled,
water-girdled, water-rocked, etc.
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Hard water. See under Hard.
Inch of water, a unit of measure of quantity of water,
being the quantity which will flow through an orifice one
inch square, or a circular orifice one inch in diameter,
in a vertical surface, under a stated constant head; also
called miner's inch, and water inch. The shape of the
orifice and the head vary in different localities. In the
Western United States, for hydraulic mining, the standard
aperture is square and the head from 4 to 9 inches above
its center. In Europe, for experimental hydraulics, the
orifice is usually round and the head from 1/2 of an inch
to 1 inch above its top.
Mineral water, waters which are so impregnated with foreign
ingredients, such as gaseous, sulphureous, and saline
substances, as to give them medicinal properties, or a
particular flavor or temperature.
Soft water, water not impregnated with lime or mineral
salts.
To hold water. See under Hold, v. t.
To keep one's head above water, to keep afloat; fig., to
avoid failure or sinking in the struggles of life.
[Colloq.]
To make water.
(a) To pass urine. --Swift.
(b) (Naut.) To admit water; to leak.
Water of crystallization (Chem.), the water combined with
many salts in their crystalline form. This water is
loosely, but, nevertheless, chemically, combined, for it
is held in fixed and definite amount for each substance
containing it. Thus, while pure copper sulphate, CuSO4,
is a white amorphous substance, blue vitriol, the
crystallized form, CuSO4.5H2O, contains five molecules
of water of crystallization.
Water on the brain (Med.), hydrocephalus.
Water on the chest (Med.), hydrothorax.
[1913 Webster]
Note: Other phrases, in which water occurs as the first
element, will be found in alphabetical order in the
Vocabulary.
[1913 Webster] |
h2o
(wn) | H2O
n 1: binary compound that occurs at room temperature as a clear
colorless odorless tasteless liquid; freezes into ice below
0 degrees centigrade and boils above 100 degrees
centigrade; widely used as a solvent [syn: water, H2O] |
| | podobné slovo | definícia |
C2H2OH2CO2H2
(gcide) | Tartaric \Tar*tar"ic\, a. (Chem.)
Of or pertaining to tartar; derived from, or resembling,
tartar.
[1913 Webster]
Tartaric acid. (a) An acid widely diffused throughout the
vegetable kingdom, as in grapes, mountain-ash berries,
etc., and obtained from tartar as a white crystalline
substance, C2H2(OH)2.(CO2H)2, having a strong pure acid
taste. It is used in medicine, in dyeing, calico printing,
photography, etc., and also as a substitute for lemon
juice. Called also dextro-tartaric acid.
(b) By extension, any one of the series of isomeric acids
(racemic acid, levotartaric acid, inactive tartaric acid)
of which tartaric acid proper is the type.
[1913 Webster] |
C3N2H2O3
(gcide) | Parabanic \Par`a*ban"ic\, a. [Gr. ? to pass over.] (Chem.)
Pertaining to, or designating, a nitrogenous acid which is
obtained by the oxidation of uric acid, as a white
crystalline substance (C3N2H2O3); -- also called oxalyl
urea.
[1913 Webster] |
C4H8N2O3H2O
(gcide) | Asparagine \As*par"a*gine\, n. [Cf. F. asparagine.] (Chem.)
A white, nitrogenous, crystallizable substance,
C4H8N2O3+H2O, found in many plants, and first obtained from
asparagus. It is believed to aid in the disposition of
nitrogenous matter throughout the plant; -- called also
altheine.
[1913 Webster] |
C5H8NNaO4H2O
(gcide) | monosodium glutamate \monosodium glutamate\ n.
The monosodium salt of the natural amino acid L-glutamine
(C5H8NNaO4), used as a food additive to enhance flavor;
abbreviated MSG. It is usually marketed as the monhydrate
(C5H8NNaO4.H2O). It is commmonly used in Chinese-American
restaurants, and has been identified as a main cause of
Chinese restaurant syndrome.
[WordNet 1.5] |
CH2O
(gcide) | Aldehyde \Al"de*hyde\ ([a^]l"d[-e]*h[imac]d), n. [Abbrev. fr.
alcohol dehydrogenatum, alcohol deprived of its hydrogen.]
1. (Chem.) A colorless, mobile, and very volatile liquid
obtained from alcohol by certain processes of oxidation.
[1913 Webster]
2. (Chem.) Any compound having the group -CHO. Methyl
aldehyde, the simplest aldehyde, is more commonly called
formaldehyde, H-CHO, and acetic aldehyde is now more
commonly called acetaldehyde. The higher aldehydes may
be solids. A reducing sugar typically contains the
aldehyde group.
[PJC]
Note: The aldehydes are intermediate between the alcohols and
acids, and differ from the alcohols in having two less
hydrogen atoms in the molecule, as common aldehyde
(called also acetaldehyde, acetic aldehyde or
ethyl aldehyde), C2H4O; methyl aldehyde (called
also formaldehyde), CH2O.
[1913 Webster +PJC]
Aldehyde ammonia (Chem.), a compound formed by the union of
aldehyde with ammonia.
[1913 Webster] |
CH2O2CO2H2
(gcide) | Mesoxalic \Mes`ox*al"ic\, a. [Mes- + oxalic.] (Chem.)
Pertaining to, or designating, an acid, CH2O2(CO2H)2,
obtained from amido malonic acid.
[1913 Webster] |
CH2OH
(gcide) | Primary \Pri"ma*ry\, a. [L. primarius, fr. primus first: cf. F.
primaire. See Prime, a., and cf. Premier, Primero.]
1. First in order of time or development or in intention;
primitive; fundamental; original.
[1913 Webster]
The church of Christ, in its primary institution.
--Bp. Pearson.
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These I call original, or primary, qualities of
body. --Locke.
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2. First in order, as being preparatory to something higher;
as, primary assemblies; primary schools.
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3. First in dignity or importance; chief; principal; as,
primary planets; a matter of primary importance.
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4. (Geol.) Earliest formed; fundamental.
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5. (Chem.) Illustrating, possessing, or characterized by,
some quality or property in the first degree; having
undergone the first stage of substitution or replacement.
[1913 Webster]
Primary alcohol (Organic Chem.), any alcohol which possess
the group CH2.OH, and can be oxidized so as to form a
corresponding aldehyde and acid having the same number of
carbon atoms; -- distinguished from {secondary & tertiary
alcohols}.
Primary amine (Chem.), an amine containing the amido group,
or a derivative of ammonia in which only one atom of
hydrogen has been replaced by a basic radical; --
distinguished from secondary & tertiary amines.
Primary amputation (Surg.), an amputation for injury
performed as soon as the shock due to the injury has
passed away, and before symptoms of inflammation
supervene.
Primary axis (Bot.), the main stalk which bears a whole
cluster of flowers.
Primary colors. See under Color.
Primary meeting, a meeting of citizens at which the first
steps are taken towards the nomination of candidates, etc.
See Caucus.
Primary pinna (Bot.), one of those portions of a compound
leaf or frond which branch off directly from the main
rhachis or stem, whether simple or compounded.
Primary planets. (Astron.) See the Note under Planet.
Primary qualities of bodies, such are essential to and
inseparable from them.
Primary quills (Zool.), the largest feathers of the wing of
a bird; primaries.
Primary rocks (Geol.), a term early used for rocks supposed
to have been first formed, being crystalline and
containing no organic remains, as granite, gneiss, etc.;
-- called also primitive rocks. The terms Secondary,
Tertiary, and Quaternary rocks have also been used in like
manner, but of these the last two only are now in use.
Primary salt (Chem.), a salt derived from a polybasic acid
in which only one acid hydrogen atom has been replaced by
a base or basic radical.
Primary syphilis (Med.), the initial stage of syphilis,
including the period from the development of the original
lesion or chancre to the first manifestation of symptoms
indicative of general constitutional infection.
Primary union (Surg.), union without suppuration; union by
the first intention.
[1913 Webster] |
CH33NCH2CH2OCOCH3OH-
(gcide) | acetylcholine \acetylcholine\ n.
1. a neurotransmitter released by the transmitting dendron at
autononmous synapses and at neuromuscular junctions. It is
a quaternary amine with an obligatory negative counterion.
The nominal formula for the hydroxide form is C7H17NO3.
Structural formula (CH3)3N(+)CH2CH2.O.CO.CH3.OH(-).
Note: Acetylcholine is the first recognized and best-studied
of the neurotransmitters. At receptors it is recycled
into choline by the action of acetylcholinesterase.
Acetylcholinesterase inhibitors therefore function as
nerve poisons. For biochemical studies it is prepared
typically in the chloride or bromide forms.
[WordNet 1.5 +PJC] |
CH3-CH2-OH
(gcide) | molecular formula \mo*lec"u*lar form"u*la\, n. (Chem.)
An expression representing the composition of elements in a
chemical substance, commonly consisting of a series of
letters and numbers comprising the atomic symbols of each
element present in a compound followed by the number of atoms
of that element present in one molecule of the substance.
Thus the molecular formula for common alcohol (ethyl alcohol)
is C2H6O, meaning that each molecule contains two carbon
atoms, six hydrogen atoms, and one oxygen atom. The molecular
formula may be written to provide some indication of the
actual structure of the molecule, in which case structural
units may be written separately. Thus, ethyl alcohol can also
be written as CH3.CH2.OH or CH3-CH2-OH, in which the
period or dash between functional groups indicates a single
bond between the principle atoms of each group. This formula
shows that in ethyl alcohol, the carbon of a methyl group
(CH3-) is attached to the carbon of a methylene group
(-CH2-), which is attached to the oxygen of a hydroxyl
group (-OH). A structural formula is a graphical
depiction of the relative positions of atoms in a molecule,
and may be very complicated.
[PJC]Alcohol \Al"co*hol\ ([a^]l"k[-o]*h[o^]l), n. [Cf. F. alcool,
formerly written alcohol, Sp. alcohol alcohol, antimony,
galena, OSp. alcofol; all fr. Ar. al-kohl a powder of
antimony or galena, to paint the eyebrows with. The name was
afterwards applied, on account of the fineness of this
powder, to highly rectified spirits, a signification unknown
in Arabia. The Sp. word has both meanings. Cf. Alquifou.]
1. An impalpable powder. [Obs.]
[1913 Webster]
2. The fluid essence or pure spirit obtained by distillation.
[Obs.] --Boyle.
[1913 Webster]
3. Pure spirit of wine; pure or highly rectified spirit
(called also ethyl alcohol or ethanol, CH3.CH2.OH);
the spirituous or intoxicating element of fermented or
distilled liquors, or more loosely a liquid containing it
in considerable quantity. It is extracted by simple
distillation from various vegetable juices and infusions
of a saccharine nature, which have undergone vinous
fermentation.
Note: [The ferementation is usually carried out by addition
of brewer's yeast, Saccharomyces cerevisiae to an
aqueous solution containing carbohydrates.]
[1913 Webster +PJC]
Note: As used in the U. S. "Pharmacop[oe]ia," alcohol
contains 91 per cent by weight of ethyl alcohol and 9
per cent of water; and diluted alcohol (proof spirit)
contains 45.5 per cent by weight of ethyl alcohol and
54.5 per cent of water.
[1913 Webster]
4. (Organic Chem.) A class of compounds analogous to vinic
alcohol in constitution. Chemically speaking, they are
hydroxides of certain organic radicals; as, the radical
ethyl forms common or ethyl alcohol (C2H5.OH); methyl
forms methyl alcohol (CH3.OH) or wood alcohol; amyl
forms amyl alcohol (C5H11.OH) or fusel oil, etc.
[1913 Webster] |
CH3CH2OH
(gcide) | molecular formula \mo*lec"u*lar form"u*la\, n. (Chem.)
An expression representing the composition of elements in a
chemical substance, commonly consisting of a series of
letters and numbers comprising the atomic symbols of each
element present in a compound followed by the number of atoms
of that element present in one molecule of the substance.
Thus the molecular formula for common alcohol (ethyl alcohol)
is C2H6O, meaning that each molecule contains two carbon
atoms, six hydrogen atoms, and one oxygen atom. The molecular
formula may be written to provide some indication of the
actual structure of the molecule, in which case structural
units may be written separately. Thus, ethyl alcohol can also
be written as CH3.CH2.OH or CH3-CH2-OH, in which the
period or dash between functional groups indicates a single
bond between the principle atoms of each group. This formula
shows that in ethyl alcohol, the carbon of a methyl group
(CH3-) is attached to the carbon of a methylene group
(-CH2-), which is attached to the oxygen of a hydroxyl
group (-OH). A structural formula is a graphical
depiction of the relative positions of atoms in a molecule,
and may be very complicated.
[PJC]Alcohol \Al"co*hol\ ([a^]l"k[-o]*h[o^]l), n. [Cf. F. alcool,
formerly written alcohol, Sp. alcohol alcohol, antimony,
galena, OSp. alcofol; all fr. Ar. al-kohl a powder of
antimony or galena, to paint the eyebrows with. The name was
afterwards applied, on account of the fineness of this
powder, to highly rectified spirits, a signification unknown
in Arabia. The Sp. word has both meanings. Cf. Alquifou.]
1. An impalpable powder. [Obs.]
[1913 Webster]
2. The fluid essence or pure spirit obtained by distillation.
[Obs.] --Boyle.
[1913 Webster]
3. Pure spirit of wine; pure or highly rectified spirit
(called also ethyl alcohol or ethanol, CH3.CH2.OH);
the spirituous or intoxicating element of fermented or
distilled liquors, or more loosely a liquid containing it
in considerable quantity. It is extracted by simple
distillation from various vegetable juices and infusions
of a saccharine nature, which have undergone vinous
fermentation.
Note: [The ferementation is usually carried out by addition
of brewer's yeast, Saccharomyces cerevisiae to an
aqueous solution containing carbohydrates.]
[1913 Webster +PJC]
Note: As used in the U. S. "Pharmacop[oe]ia," alcohol
contains 91 per cent by weight of ethyl alcohol and 9
per cent of water; and diluted alcohol (proof spirit)
contains 45.5 per cent by weight of ethyl alcohol and
54.5 per cent of water.
[1913 Webster]
4. (Organic Chem.) A class of compounds analogous to vinic
alcohol in constitution. Chemically speaking, they are
hydroxides of certain organic radicals; as, the radical
ethyl forms common or ethyl alcohol (C2H5.OH); methyl
forms methyl alcohol (CH3.OH) or wood alcohol; amyl
forms amyl alcohol (C5H11.OH) or fusel oil, etc.
[1913 Webster] |
CuSO45H2O
(gcide) | Water \Wa"ter\ (w[add]"t[~e]r), n. [AS. w[ae]ter; akin to OS.
watar, OFries. wetir, weter, LG. & D. water, G. wasser, OHG.
wazzar, Icel. vatn, Sw. vatten, Dan. vand, Goth. wat[=o], O.
Slav. & Russ. voda, Gr. 'y`dwr, Skr. udan water, ud to wet,
and perhaps to L. unda wave. [root]137. Cf. Dropsy,
Hydra, Otter, Wet, Whisky.]
1. The fluid which descends from the clouds in rain, and
which forms rivers, lakes, seas, etc. "We will drink
water." --Shak. "Powers of fire, air, water, and earth."
--Milton.
[1913 Webster]
Note: Pure water consists of hydrogen and oxygen, H2O, and
is a colorless, odorless, tasteless, transparent
liquid, which is very slightly compressible. At its
maximum density, 39[deg] Fahr. or 4[deg] C., it is the
standard for specific gravities, one cubic centimeter
weighing one gram. It freezes at 32[deg] Fahr. or
0[deg] C. and boils at 212[deg] Fahr. or 100[deg] C.
(see Ice, Steam). It is the most important natural
solvent, and is frequently impregnated with foreign
matter which is mostly removed by distillation; hence,
rain water is nearly pure. It is an important
ingredient in the tissue of animals and plants, the
human body containing about two thirds its weight of
water.
[1913 Webster]
2. A body of water, standing or flowing; a lake, river, or
other collection of water.
[1913 Webster]
Remembering he had passed over a small water a poor
scholar when first coming to the university, he
kneeled. --Fuller.
[1913 Webster]
3. Any liquid secretion, humor, or the like, resembling
water; esp., the urine.
[1913 Webster]
4. (Pharm.) A solution in water of a gaseous or readily
volatile substance; as, ammonia water. --U. S. Pharm.
[1913 Webster]
5. The limpidity and luster of a precious stone, especially a
diamond; as, a diamond of the first water, that is,
perfectly pure and transparent. Hence, of the first water,
that is, of the first excellence.
[1913 Webster]
6. A wavy, lustrous pattern or decoration such as is imparted
to linen, silk, metals, etc. See Water, v. t., 3,
Damask, v. t., and Damaskeen.
[1913 Webster]
7. An addition to the shares representing the capital of a
stock company so that the aggregate par value of the
shares is increased while their value for investment is
diminished, or "diluted." [Brokers' Cant]
[1913 Webster]
Note: Water is often used adjectively and in the formation of
many self-explaining compounds; as, water drainage;
water gauge, or water-gauge; waterfowl, water-fowl, or
water fowl; water-beaten; water-borne, water-circled,
water-girdled, water-rocked, etc.
[1913 Webster]
Hard water. See under Hard.
Inch of water, a unit of measure of quantity of water,
being the quantity which will flow through an orifice one
inch square, or a circular orifice one inch in diameter,
in a vertical surface, under a stated constant head; also
called miner's inch, and water inch. The shape of the
orifice and the head vary in different localities. In the
Western United States, for hydraulic mining, the standard
aperture is square and the head from 4 to 9 inches above
its center. In Europe, for experimental hydraulics, the
orifice is usually round and the head from 1/2 of an inch
to 1 inch above its top.
Mineral water, waters which are so impregnated with foreign
ingredients, such as gaseous, sulphureous, and saline
substances, as to give them medicinal properties, or a
particular flavor or temperature.
Soft water, water not impregnated with lime or mineral
salts.
To hold water. See under Hold, v. t.
To keep one's head above water, to keep afloat; fig., to
avoid failure or sinking in the struggles of life.
[Colloq.]
To make water.
(a) To pass urine. --Swift.
(b) (Naut.) To admit water; to leak.
Water of crystallization (Chem.), the water combined with
many salts in their crystalline form. This water is
loosely, but, nevertheless, chemically, combined, for it
is held in fixed and definite amount for each substance
containing it. Thus, while pure copper sulphate, CuSO4,
is a white amorphous substance, blue vitriol, the
crystallized form, CuSO4.5H2O, contains five molecules
of water of crystallization.
Water on the brain (Med.), hydrocephalus.
Water on the chest (Med.), hydrothorax.
[1913 Webster]
Note: Other phrases, in which water occurs as the first
element, will be found in alphabetical order in the
Vocabulary.
[1913 Webster] |
H2O
(gcide) | H2O \H2O\ n. ([=a]ch`t[=oo]`[=o]"),
The chemical formula for water.
Syn: water, hydrogen oxide.
[WordNet 1.5]Molecular \Mo*lec"u*lar\, a. [Cf. F. mol['e]culare. See
Molecule.] (Phys. & Chem.)
Pertaining to, connected with, produced by, or consisting of,
molecules; as, molecular forces; molecular groups of atoms,
etc.
[1913 Webster]
Molecular attraction (Phys.), attraction acting between the
molecules of bodies, and at insensible distances.
Molecular weight (Chem.), the weight of a molecule of any
gas or vapor as compared with the hydrogen atom having
weight of 1 as a standard; the sum of the atomic weights
of the constituents of a molecule; thus, the molecular
weight of water (H2O) is 18. For more precise
measurements, the weight of the carbon isotope carbon-12
is used as the standard, that isotope having the value of
12.000. In this systen, now used almost universally, the
hydrogen atom has a weight of 1.0079.
[1913 Webster +PJC]Type \Type\ (t[imac]p), n. [F. type; cf. It. tipo, from L. typus
a figure, image, a form, type, character, Gr. ty`pos the mark
of a blow, impression, form of character, model, from the
root of ty`ptein to beat, strike; cf. Skr. tup to hurt.]
1. The mark or impression of something; stamp; impressed
sign; emblem.
[1913 Webster]
The faith they have in tennis, and tall stockings,
Short blistered breeches, and those types of travel.
--Shak.
[1913 Webster]
2. Form or character impressed; style; semblance.
[1913 Webster]
Thy father bears the type of king of Naples. --Shak.
[1913 Webster]
3. A figure or representation of something to come; a token;
a sign; a symbol; -- correlative to antitype.
[1913 Webster]
A type is no longer a type when the thing typified
comes to be actually exhibited. --South.
[1913 Webster]
4. That which possesses or exemplifies characteristic
qualities; the representative. Specifically:
(a) (Biol.) A general form or structure common to a number
of individuals; hence, the ideal representation of a
species, genus, or other group, combining the
essential characteristics; an animal or plant
possessing or exemplifying the essential
characteristics of a species, genus, or other group.
Also, a group or division of animals having a certain
typical or characteristic structure of body maintained
within the group.
[1913 Webster]
Since the time of Cuvier and Baer . . . the
whole animal kingdom has been universally held
to be divisible into a small number of main
divisions or types. --Haeckel.
[1913 Webster]
(b) (Fine Arts) The original object, or class of objects,
scene, face, or conception, which becomes the subject
of a copy; esp., the design on the face of a medal or
a coin.
[1913 Webster]
(c) (Chem.) A simple compound, used as a model or pattern
to which other compounds are conveniently regarded as
being related, and from which they may be actually or
theoretically derived.
[1913 Webster]
Note: The fundamental types used to express the simplest and
most essential chemical relations are hydrochloric
acid, HCl; water, H2O; ammonia, NH3; and methane,
CH4.
[1913 Webster]
5. (Typog.)
(a) A raised letter, figure, accent, or other character,
cast in metal or cut in wood, used in printing.
(b) Such letters or characters, in general, or the whole
quantity of them used in printing, spoken of
collectively; any number or mass of such letters or
characters, however disposed.
[1913 Webster]
Note: Type are mostly made by casting type metal in a mold,
though some of the larger sizes are made from maple,
mahogany, or boxwood. In the cut, a is the body; b, the
face, or part from which the impression is taken; c,
the shoulder, or top of the body; d, the nick
(sometimes two or more are made), designed to assist
the compositor in distinguishing the bottom of the face
from t`e top; e, the groove made in the process of
finishing, -- each type as cast having attached to the
bottom of the body a jet, or small piece of metal
(formed by the surplus metal poured into the mold),
which, when broken off, leaves a roughness that
requires to be removed. The fine lines at the top and
bottom of a letter are technically called ceriphs, and
when part of the face projects over the body, as in the
letter f, the projection is called a kern.
[1913 Webster] The type which compose an ordinary book
font consist of Roman CAPITALS, small capitals, and
lower-case letters, and Italic CAPITALS and lower-case
letters, with accompanying figures, points, and
reference marks, -- in all about two hundred
characters. Including the various modern styles of
fancy type, some three or four hundred varieties of
face are made. Besides the ordinary Roman and Italic,
some of the most important of the varieties are
[1913 Webster] Old English. Black Letter. Old Style.
French Elzevir. Boldface. Antique. Clarendon. Gothic.
Typewriter. Script.
[1913 Webster] The smallest body in common use is
diamond; then follow in order of size, pearl, agate,
nonpareil, minion, brevier, bourgeois (or two-line
diamond), long primer (or two-line pearl), small pica
(or two-line agate), pica (or two-line nonpareil),
English (or two-line minion), Columbian (or two-line
brevier), great primer (or two-line bourgeois), paragon
(or two-line long primer), double small pica (or
two-line small pica), double pica (or two-line pica),
double English (or two-line English), double great
primer (or two-line great primer), double paragon (or
two-line paragon), canon (or two-line double pica).
Above this, the sizes are called five-line pica,
six-line pica, seven-line pica, and so on, being made
mostly of wood. The following alphabets show the
different sizes up to great primer.
[1913 Webster] Brilliant . . abcdefghijklmnopqrstuvwxyz
Diamond . . abcdefghijklmnopqrstuvwxyz Pearl . . .
abcdefghijklmnopqrstuvwxyz Agate . . .
abcdefghijklmnopqrstuvwxyz Nonpareil . . .
abcdefghijklmnopqrstuvwxyz Minion . . .
abcdefghijklmnopqrstuvwxyz Brevier . . .
abcdefghijklmnopqrstuvwxyz Bourgeois . .
abcdefghijklmnopqrstuvwxyz Long primer . . .
abcdefghijklmnopqrstuvwxyz Small pica . .
abcdefghijklmnopqrstuvwxyz Pica . . . . .
abcdefghijklmnopqrstuvwxyz English . . .
abcdefghijklmnopqrstuvwxyz Columbian . . .
abcdefghijklmnopqrstuvwxyz Great primer . . .
abcdefghijklmnopqrstuvwxyz
[1913 Webster] The foregoing account is conformed to
the designations made use of by American type founders,
but is substantially correct for England. Agate,
however, is called ruby, in England, where, also, a
size intermediate between nonpareil and minion is
employed, called emerald.
[1913 Webster]
Point system of type bodies (Type Founding), a system
adopted by the type founders of the United States by which
the various sizes of type have been so modified and
changed that each size bears an exact proportional
relation to every other size. The system is a modification
of a French system, and is based on the pica body. This
pica body is divided into twelfths, which are termed
"points," and every type body consist of a given number of
these points. Many of the type founders indicate the new
sizes of type by the number of points, and the old names
are gradually being done away with. By the point system
type founders cast type of a uniform size and height,
whereas formerly fonts of pica or other type made by
different founders would often vary slightly so that they
could not be used together. There are no type in actual
use corresponding to the smaller theoretical sizes of the
point system. In some cases, as in that of ruby, the term
used designates a different size from that heretofore so
called.
[1913 Webster] 1 American 9 Bourgeois [bar] [bar] 11/2
German [bar] 2 Saxon 10 Long Primer [bar] [bar] 21/2 Norse
[bar] 3 Brilliant 11 Small Pica [bar] [bar] 31/2 Ruby 12
Pica [bar] [bar] 4 Excelsior [bar] 41/2 Diamond 14 English
[bar] [bar] 5 Pearl 16 Columbian [bar] [bar] 51/2 Agate
[bar] 6 Nonpareil 18 Great Primer [bar] [bar] 7 Minion
[bar] 8 Brevier 20 Paragon [bar] [bar] Diagram of the
"points" by which sizes of Type are graduated in the
"Point System".
[1913 Webster]
Type founder, one who casts or manufacture type.
Type foundry, Type foundery, a place for the manufacture
of type.
Type metal, an alloy used in making type, stereotype
plates, etc., and in backing up electrotype plates. It
consists essentially of lead and antimony, often with a
little tin, nickel, or copper.
Type wheel, a wheel having raised letters or characters on
its periphery, and used in typewriters, printing
telegraphs, etc.
Unity of type (Biol.), that fundamental agreement in
structure which is seen in organic beings of the same
class, and is quite independent of their habits of life.
--Darwin.
[1913 Webster]Water \Wa"ter\ (w[add]"t[~e]r), n. [AS. w[ae]ter; akin to OS.
watar, OFries. wetir, weter, LG. & D. water, G. wasser, OHG.
wazzar, Icel. vatn, Sw. vatten, Dan. vand, Goth. wat[=o], O.
Slav. & Russ. voda, Gr. 'y`dwr, Skr. udan water, ud to wet,
and perhaps to L. unda wave. [root]137. Cf. Dropsy,
Hydra, Otter, Wet, Whisky.]
1. The fluid which descends from the clouds in rain, and
which forms rivers, lakes, seas, etc. "We will drink
water." --Shak. "Powers of fire, air, water, and earth."
--Milton.
[1913 Webster]
Note: Pure water consists of hydrogen and oxygen, H2O, and
is a colorless, odorless, tasteless, transparent
liquid, which is very slightly compressible. At its
maximum density, 39[deg] Fahr. or 4[deg] C., it is the
standard for specific gravities, one cubic centimeter
weighing one gram. It freezes at 32[deg] Fahr. or
0[deg] C. and boils at 212[deg] Fahr. or 100[deg] C.
(see Ice, Steam). It is the most important natural
solvent, and is frequently impregnated with foreign
matter which is mostly removed by distillation; hence,
rain water is nearly pure. It is an important
ingredient in the tissue of animals and plants, the
human body containing about two thirds its weight of
water.
[1913 Webster]
2. A body of water, standing or flowing; a lake, river, or
other collection of water.
[1913 Webster]
Remembering he had passed over a small water a poor
scholar when first coming to the university, he
kneeled. --Fuller.
[1913 Webster]
3. Any liquid secretion, humor, or the like, resembling
water; esp., the urine.
[1913 Webster]
4. (Pharm.) A solution in water of a gaseous or readily
volatile substance; as, ammonia water. --U. S. Pharm.
[1913 Webster]
5. The limpidity and luster of a precious stone, especially a
diamond; as, a diamond of the first water, that is,
perfectly pure and transparent. Hence, of the first water,
that is, of the first excellence.
[1913 Webster]
6. A wavy, lustrous pattern or decoration such as is imparted
to linen, silk, metals, etc. See Water, v. t., 3,
Damask, v. t., and Damaskeen.
[1913 Webster]
7. An addition to the shares representing the capital of a
stock company so that the aggregate par value of the
shares is increased while their value for investment is
diminished, or "diluted." [Brokers' Cant]
[1913 Webster]
Note: Water is often used adjectively and in the formation of
many self-explaining compounds; as, water drainage;
water gauge, or water-gauge; waterfowl, water-fowl, or
water fowl; water-beaten; water-borne, water-circled,
water-girdled, water-rocked, etc.
[1913 Webster]
Hard water. See under Hard.
Inch of water, a unit of measure of quantity of water,
being the quantity which will flow through an orifice one
inch square, or a circular orifice one inch in diameter,
in a vertical surface, under a stated constant head; also
called miner's inch, and water inch. The shape of the
orifice and the head vary in different localities. In the
Western United States, for hydraulic mining, the standard
aperture is square and the head from 4 to 9 inches above
its center. In Europe, for experimental hydraulics, the
orifice is usually round and the head from 1/2 of an inch
to 1 inch above its top.
Mineral water, waters which are so impregnated with foreign
ingredients, such as gaseous, sulphureous, and saline
substances, as to give them medicinal properties, or a
particular flavor or temperature.
Soft water, water not impregnated with lime or mineral
salts.
To hold water. See under Hold, v. t.
To keep one's head above water, to keep afloat; fig., to
avoid failure or sinking in the struggles of life.
[Colloq.]
To make water.
(a) To pass urine. --Swift.
(b) (Naut.) To admit water; to leak.
Water of crystallization (Chem.), the water combined with
many salts in their crystalline form. This water is
loosely, but, nevertheless, chemically, combined, for it
is held in fixed and definite amount for each substance
containing it. Thus, while pure copper sulphate, CuSO4,
is a white amorphous substance, blue vitriol, the
crystallized form, CuSO4.5H2O, contains five molecules
of water of crystallization.
Water on the brain (Med.), hydrocephalus.
Water on the chest (Med.), hydrothorax.
[1913 Webster]
Note: Other phrases, in which water occurs as the first
element, will be found in alphabetical order in the
Vocabulary.
[1913 Webster] |
H2O2
(gcide) | Hydrogen \Hy"dro*gen\, n. [Hydro-, 1 + -gen: cf. F.
hydrog[`e]ne. So called because water is generated by its
combustion. See Hydra.] (Chem.)
A gaseous element, colorless, tasteless, and odorless, the
lightest known substance, being fourteen and a half times
lighter than air (hence its use in filling balloons), and
over eleven thousand times lighter than water. It is very
abundant, being an ingredient of water and of many other
substances, especially those of animal or vegetable origin.
It may by produced in many ways, but is chiefly obtained by
the action of acids (as sulphuric) on metals, as zinc, iron,
etc. It is very inflammable, and is an ingredient of coal gas
and water gas. It is standard of chemical equivalents or
combining weights, and also of valence, being the typical
monad. Symbol H. Atomic weight 1.
[1913 Webster]
Note: Although a gas, hydrogen is chemically similar to the
metals in its nature, having the properties of a weak
base. It is, in all acids, the base which is replaced
by metals and basic radicals to form salts. Like all
other gases, it is condensed by great cold and pressure
to a liquid which freezes and solidifies by its own
evaporation. It is absorbed in large quantities by
certain metals (esp. palladium), forming alloy-like
compounds; hence, in view of quasi-metallic nature, it
is sometimes called hydrogenium. It is the typical
reducing agent, as opposed to oxidizers, as oxygen,
chlorine, etc.
[1913 Webster]
Bicarbureted hydrogen, an old name for ethylene.
Carbureted hydrogen gas. See under Carbureted.
Hydrogen dioxide, a thick, colorless liquid, H2O2,
resembling water, but having a bitter, sour taste,
produced by the action of acids on barium peroxide. It
decomposes into water and oxygen, and is manufactured in
large quantities for an oxidizing and bleaching agent.
Called also oxygenated water.
Hydrogen oxide, a chemical name for water, H?O.
Hydrogen sulphide, a colorless inflammable gas, H2S,
having the characteristic odor of bad eggs, and found in
many mineral springs. It is produced by the action of
acids on metallic sulphides, and is an important chemical
reagent. Called also sulphureted hydrogen.
[1913 Webster] |
HOCH2CHOH4CH2OH
(gcide) | mannitol \man"ni*tol\, n. [Mannite + -ol.]
1. (Chem.) A white crystalline hexose
(HO.CH2.(CHOH)4.CH2.OH) of a sweet taste obtained from a
so-called manna, the dried sap of the flowering ash
(Fraxinus ornus); -- called also mannite, and {hydroxy
hexane}. Cf. Dulcite. It is used in pharmacy as
excipient and diluent for solids and liquids. It is also
used as a food additive for anti-caking properties, or as
a sweetener, and, illegally, to "cut" (dilute) illegal
drugs such as cocaine or heroin.
Syn: D-mannitol; manna sugar; cordycepic acid; Diosmol;
Mannicol; Mannidex; Osmiktrol; Osmosal.
[1913 Webster +PJC] |
Na2CO310H2O
(gcide) | Sodium \So"di*um\, n. [NL., fr.E. soda.] (Chem.)
A common metallic element of the alkali group, in nature
always occuring combined, as in common salt, in albite, etc.
It is isolated as a soft, waxy, white, unstable metal, so
highly reactive that it combines violently with water, and to
be preserved must be kept under petroleum or some similar
liquid. Sodium is used combined in many salts, in the free
state as a reducer, and as a means of obtaining other metals
(as magnesium and aluminium) is an important commercial
product. Symbol Na (Natrium). Atomic weight 22.990.
Specific gravity 0.97.
[1913 Webster]
Sodium amalgam, an alloy of sodium and mercury, usually
produced as a gray metallic crystalline substance, which
is used as a reducing agent, and otherwise.
Sodium carbonate, a white crystalline substance,
Na2CO3.10H2O, having a cooling alkaline taste, found in
the ashes of many plants, and produced artifically in
large quantities from common salt. It is used in making
soap, glass, paper, etc., and as alkaline agent in many
chemical industries. Called also sal soda, {washing
soda}, or soda. Cf. Sodium bicarbonate, and Trona.
Sodium chloride, common, or table, salt, NaCl.
Sodium hydroxide, a white opaque brittle solid, NaOH,
having a fibrous structure, produced by the action of
quicklime, or of calcium hydrate (milk of lime), on sodium
carbonate. It is a strong alkali, and is used in the
manufacture of soap, in making wood pulp for paper, etc.
Called also sodium hydrate, and caustic soda. By
extension, a solution of sodium hydroxide.
[1913 Webster] |
Na2CO32HNaCO32H2O
(gcide) | Trona \Tro"na\, n. [Of Egyptian or North African origin.] (Chem.
& Min.)
A native double salt, consisting of a combination of neutral
and acid sodium carbonate, Na2CO3.2HNaCO3.2H2O, occurring
as a white crystalline fibrous deposit from certain soda
brine springs and lakes; -- called also urao, and by the
ancients nitrum.
[1913 Webster] |
Na2SO410H2O
(gcide) | Sodium sulphate \So"di*um sul"phate\
A salt well known as a catharic under the name of {Glauber's
salt}, which term is properly applied to the hydrate,
Na2SO4.10H2O.
[Webster 1913 Suppl.] |
NaKCO36H2O
(gcide) | Double \Dou"ble\ (d[u^]b"'l), a. [OE. doble, duble, double, OF.
doble, duble, double, F. double, fr. L. duplus, fr. the root
of duo two, and perh. that of plenus full; akin to Gr.
diplo`os double. See Two, and Full, and cf. Diploma,
Duple.]
1. Twofold; multiplied by two; increased by its equivalent;
made twice as large or as much, etc.
[1913 Webster]
Let a double portion of thy spirit be upon me. -- 2
Kings ii. 9.
[1913 Webster]
Darkness and tempest make a double night. --Dryden.
[1913 Webster]
2. Being in pairs; presenting two of a kind, or two in a set
together; coupled.
[1913 Webster]
[Let] The swan, on still St. Mary's lake,
Float double, swan and shadow. --Wordsworth.
[1913 Webster]
3. Divided into two; acting two parts, one openly and the
other secretly; equivocal; deceitful; insincere.
[1913 Webster]
With a double heart do they speak. -- Ps. xii. 2.
[1913 Webster]
4. (Bot.) Having the petals in a flower considerably
increased beyond the natural number, usually as the result
of cultivation and the expense of the stamens, or stamens
and pistils. The white water lily and some other plants
have their blossoms naturally double.
[1913 Webster]
Note: Double is often used as the first part of a compound
word, generally denoting two ways, or twice the number,
quantity, force, etc., twofold, or having two.
[1913 Webster]
Double base, or Double bass (Mus.), the largest and
lowest-toned instrument in the violin form; the
contrabasso or violone.
Double convex. See under Convex.
Double counterpoint (Mus.), that species of counterpoint or
composition, in which two of the parts may be inverted, by
setting one of them an octave higher or lower.
Double court (Lawn Tennis), a court laid out for four
players, two on each side.
Double dagger (Print.), a reference mark ([dag]) next to
the dagger ([dagger]) in order; a diesis.
Double drum (Mus.), a large drum that is beaten at both
ends.
Double eagle, a gold coin of the United States having the
value of 20 dollars.
Double entry. See under Bookkeeping.
Double floor (Arch.), a floor in which binding joists
support flooring joists above and ceiling joists below.
See Illust. of Double-framed floor.
Double flower. See Double, a., 4.
Double-framed floor (Arch.), a double floor having girders
into which the binding joists are framed.
Double fugue (Mus.), a fugue on two subjects.
Double letter.
(a) (Print.) Two letters on one shank; a ligature.
(b) A mail requiring double postage.
Double note (Mus.), a note of double the length of the
semibreve; a breve. See Breve.
Double octave (Mus.), an interval composed of two octaves,
or fifteen notes, in diatonic progression; a fifteenth.
Double pica. See under Pica.
Double play (Baseball), a play by which two players are put
out at the same time.
Double plea (Law), a plea alleging several matters in
answer to the declaration, where either of such matters
alone would be a sufficient bar to the action. --Stephen.
Double point (Geom.), a point of a curve at which two
branches cross each other. Conjugate or isolated points of
a curve are called double points, since they possess most
of the properties of double points (see Conjugate). They
are also called acnodes, and those points where the
branches of the curve really cross are called crunodes.
The extremity of a cusp is also a double point.
Double quarrel. (Eccl. Law) See Duplex querela, under
Duplex.
Double refraction. (Opt.) See Refraction.
Double salt. (Chem.)
(a) A mixed salt of any polybasic acid which has been
saturated by different bases or basic radicals, as the
double carbonate of sodium and potassium,
NaKCO3.6H2O.
(b) A molecular combination of two distinct salts, as
common alum, which consists of the sulphate of
aluminium, and the sulphate of potassium or ammonium.
Double shuffle, a low, noisy dance.
Double standard (Polit. Econ.), a double standard of
monetary values; i. e., a gold standard and a silver
standard, both of which are made legal tender.
Double star (Astron.), two stars so near to each other as
to be seen separate only by means of a telescope. Such
stars may be only optically near to each other, or may be
physically connected so that they revolve round their
common center of gravity, and in the latter case are
called also binary stars.
Double time (Mil.). Same as Double-quick.
Double window, a window having two sets of glazed sashes
with an air space between them.
[1913 Webster] |
NH2OH
(gcide) | Hydroxylamine \Hy*drox`yl*am"ine\, n. [Hydroxyl + amine.]
(Chem.)
A nitrogenous, organic base, NH2.OH, resembling ammonia,
and produced by a modified reduction of nitric acid. It is
usually obtained as a volatile, unstable solution in water.
It acts as a strong reducing agent.
[1913 Webster] |
RCH2OH
(gcide) | Secondary \Sec"ond*a*ry\, a. [Cf. F. secondaire, L. secundaire.
See Second, a.]
1. Succeeding next in order to the first; of second place,
origin, rank, etc.; not primary; subordinate; not of the
first order or rate.
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Wheresoever there is moral right on the one hand, no
secondary right can discharge it. --L'Estrange.
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Two are the radical differences; the secondary
differences are as four. --Bacon.
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2. Acting by deputation or delegated authority; as, the work
of secondary hands.
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3. (Chem.) Possessing some quality, or having been subject to
some operation (as substitution), in the second degree;
as, a secondary salt, a secondary amine, etc. Cf.
primary.
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Note: A primary amine has the general formula R.NH2; a
secondary amine has the general formula R.NH.R',
where R and R' are alkyl or aryl groups. A primary
alcohol has the general formula R.CH2.OH; a secondary
alcohol has the general formula R.CHOH.R'. Tertiary
amines and alcohols have the general formulas
R.CR'N.R' and R.CR'OH.R', respectively.
[PJC]
4. (Min.) Subsequent in origin; -- said of minerals produced
by alteration or deposition subsequent to the formation of
the original rock mass; also of characters of minerals (as
secondary cleavage, etc.) developed by pressure or other
causes.
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5. (Zool.) Pertaining to the second joint of the wing of a
bird.
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6. (Med.)
(a) Dependent or consequent upon another disease; as,
Bright's disease is often secondary to scarlet fever.
(b) Occurring in the second stage of a disease; as, the
secondary symptoms of syphilis.
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Secondary accent. See the Note under Accent, n., 1.
Secondary age. (Geol.) The Mesozoic age, or age before the
Tertiary. See Mesozoic, and Note under Age, n., 8.
Secondary alcohol (Chem.), any one of a series of alcohols
which contain the radical CH.OH united with two
hydrocarbon radicals. On oxidation the secondary alcohols
form ketones.
Secondary amputation (Surg.), an amputation for injury,
performed after the constitutional effects of the injury
have subsided.
Secondary axis (Opt.), any line which passes through the
optical center of a lens but not through the centers of
curvature, or, in the case of a mirror, which passes
through the center of curvature but not through the center
of the mirror.
Secondary battery. (Elec.) See under Battery, n., 4.
Secondary circle (Geom. & Astron.), a great circle that
passes through the poles of another great circle and is
therefore perpendicular to its plane.
Secondary circuit, Secondary coil (Elec.), a circuit or
coil in which a current is produced by the induction of a
current in a neighboring circuit or coil called the
primary circuit or coil.
Secondary color, a color formed by mixing any two primary
colors in equal proportions.
Secondary coverts (Zool.), the longer coverts which overlie
the basal part of the secondary quills of a bird. See
Illust. under Bird.
Secondary crystal (Min.), a crystal derived from one of the
primary forms.
Secondary current (Elec.), a momentary current induced in a
closed circuit by a current of electricity passing through
the same or a contiguous circuit at the beginning and also
at the end of the passage of the primary current.
Secondary evidence, that which is admitted upon failure to
obtain the primary or best evidence.
Secondary fever (Med.), a fever coming on in a disease
after the subsidence of the fever with which the disease
began, as the fever which attends the outbreak of the
eruption in smallpox.
Secondary hemorrhage (Med.), hemorrhage occuring from a
wounded blood vessel at some considerable time after the
original bleeding has ceased.
Secondary planet. (Astron.) See the Note under Planet.
Secondary qualities, those qualities of bodies which are
not inseparable from them as such, but are dependent for
their development and intensity on the organism of the
percipient, such as color, taste, odor, etc.
Secondary quills or Secondary remiges (Zool.), the quill
feathers arising from the forearm of a bird and forming a
row continuous with the primaries; -- called also
secondaries. See Illust. of Bird.
Secondary rocks or Secondary strata (Geol.), those lying
between the Primary, or Paleozoic, and Tertiary (see
Primary rocks, under Primary); -- later restricted to
strata of the Mesozoic age, and at present but little
used.
Secondary syphilis (Med.), the second stage of syphilis,
including the period from the first development of
constitutional symptoms to the time when the bones and the
internal organs become involved.
Secondary tint, any subdued tint, as gray.
Secondary union (Surg.), the union of wounds after
suppuration; union by the second intention.
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Syn: Second; second-rate; subordinate; inferior.
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ROCH2CHOR'CH2OPO2OCH2CH2NH2
(gcide) | cephalin \ceph"a*lin\ (k[e^]f"[.a]*l[i^]n), n. [Gr. kefalh` the
head; it was supposed by Thudichum to exist in brain tissue.]
(Physiol. Chem.)
One of a group of phospholipids (nitrogenous phosphorized
fatty substances), present in all living cells and
particularly evident in nervous tissue. The cephalins consist
of glycerol phosphate in which the two free hydroxyls of the
glycerol are esterified with fatty acids, and the phosphate
forms an ester linkage to the hydroxyl of ethanolamine. The
phosphate may be linked to the alpha (end) or beta (middle)
hydroxyl of the glycerol portion. The natural isomers are of
the alpha form, and have the general formula
R.O.CH2.CHOR'.CH2.O.PO2.O.CH2.CH2.NH2, where R and R' are
the acyl residues of long-chain fatty acids, which may be the
same or different. [Also spelled kephalin.]
Syn: phosphatidylethanolamine. [PJC] |
SnCl2H2O2
(gcide) | Stannous \Stan"nous\ (-n[u^]s), a. (Chem.)
Pertaining to, or containing, tin; specifically, designating
those compounds in which the element has a lower valence as
contrasted with stannic compounds.
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Stannous chloride (Chem.), a white crystalline substance,
SnCl2.(H2O)2, obtained by dissolving tin in hydrochloric
acid. It is used as a mordant in dyeing.
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SO43Cr2K2SO424H2O
(gcide) | Chrome \Chrome\, n.
Same as Chromium.
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Chrome alum (Chem.), a dark violet substance,
(SO4)3Cr2.K2SO4.24H2O, analogous to, and crystallizing
like, common alum. It is regarded as a double sulphate of
chromium and potassium.
Chrome green
(a) The green oxide of chromium, Cr2O3, used in enamel
painting, and glass staining.
(b) A pigment made by mixing chrome yellow with Prussian
blue.
Chrome red, a beautiful red pigment originally prepared
from the basic chromate of lead, but now made from red
oxide of lead.
Chrome yellow, a brilliant yellow pigment, PbCrO4, used
by painters.
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