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Compound crystal
(gcide) | Compound \Com"pound\, a. [OE. compouned, p. p. of compounen. See
Compound, v. t.]
Composed of two or more elements, ingredients, parts;
produced by the union of several ingredients, parts, or
things; composite; as, a compound word.
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Compound substances are made up of two or more simple
substances. --I. Watts.
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Compound addition, subtraction, multiplication,
division (Arith.), the addition, subtraction, etc., of
compound numbers.
Compound crystal (Crystallog.), a twin crystal, or one
seeming to be made up of two or more crystals combined
according to regular laws of composition.
Compound engine (Mech.), a form of steam engine in which
the steam that has been used in a high-pressure cylinder
is made to do further service in a larger low-pressure
cylinder, sometimes in several larger cylinders,
successively.
Compound ether. (Chem.) See under Ether.
Compound flower (Bot.), a flower head resembling a single
flower, but really composed of several florets inclosed in
a common calyxlike involucre, as the sunflower or
dandelion.
Compound fraction. (Math.) See Fraction.
Compound fracture. See Fracture.
Compound householder, a householder who compounds or
arranges with his landlord that his rates shall be
included in his rents. [Eng.]
Compound interest. See Interest.
Compound larceny. (Law) See Larceny.
Compound leaf (Bot.), a leaf having two or more separate
blades or leaflets on a common leafstalk.
Compound microscope. See Microscope.
Compound motion. See Motion.
Compound number (Math.), one constructed according to a
varying scale of denomination; as, 3 cwt., 1 qr., 5 lb.;
-- called also denominate number.
Compound pier (Arch.), a clustered column.
Compound quantity (Alg.), a quantity composed of two or
more simple quantities or terms, connected by the sign +
(plus) or - (minus). Thus, a + b - c, and bb - b, are
compound quantities.
Compound radical. (Chem.) See Radical.
Compound ratio (Math.), the product of two or more ratios;
thus ab:cd is a ratio compounded of the simple ratios a:c
and b:d.
Compound rest (Mech.), the tool carriage of an engine
lathe.
Compound screw (Mech.), a screw having on the same axis two
or more screws with different pitch (a differential
screw), or running in different directions (a right and
left screw).
Compound time (Mus.), that in which two or more simple
measures are combined in one; as, 6-8 time is the joining
of two measures of 3-8 time.
Compound word, a word composed of two or more words;
specifically, two or more words joined together by a
hyphen.
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Compound crystal
(gcide) | Crystal \Crys"tal\ (kr[i^]s"tal), n. [OE. cristal, F. cristal,
L. crystallum crystal, ice, fr. Gr. kry`stallos, fr. kry`os
icy cold, frost; cf. AS. crystalla, fr. L. crystallum; prob.
akin to E. crust. See Crust, Raw.]
1. (Chem. & Min.) The regular form which a substance tends to
assume in solidifying, through the inherent power of
cohesive attraction. It is bounded by plane surfaces,
symmetrically arranged, and each species of crystal has
fixed axial ratios. See Crystallization.
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2. The material of quartz, in crystallization transparent or
nearly so, and either colorless or slightly tinged with
gray, or the like; -- called also rock crystal.
Ornamental vessels are made of it. Cf. Smoky quartz,
Pebble; also Brazilian pebble, under Brazilian.
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3. A species of glass, more perfect in its composition and
manufacture than common glass, and often cut into
ornamental forms. See Flint glass.
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4. The glass over the dial of a watch case.
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5. Anything resembling crystal, as clear water, etc.
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The blue crystal of the seas. --Byron.
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Blood crystal. See under Blood.
Compound crystal. See under Compound.
Iceland crystal, a transparent variety of calcite, or
crystallized calcium carbonate, brought from Iceland, and
used in certain optical instruments, as the polariscope.
Rock crystal, or Mountain crystal, any transparent
crystal of quartz, particularly of limpid or colorless
quartz.
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