| slovo | definícia |
radon
(encz) | radon,radon n: [chem.] bezbarvý radioaktivní plyn, objeven roku 1900
(E.F. Dorn), značka Rn web |
radon
(czen) | radon,radonn: [chem.] bezbarvý radioaktivní plyn, objeven roku 1900
(E.F. Dorn), značka Rn web |
radon
(gcide) | Noble \No"ble\, a. [Compar. Nobler; superl. Noblest.] [F.
noble, fr. L. nobilis that can be or is known, well known,
famous, highborn, noble, fr. noscere to know. See know.]
1. Possessing eminence, elevation, dignity, etc.; above
whatever is low, mean, degrading, or dishonorable;
magnanimous; as, a noble nature or action; a noble heart.
[1913 Webster]
Statues, with winding ivy crowned, belong
To nobler poets for a nobler song. --Dryden.
[1913 Webster]
2. Grand; stately; magnificent; splendid; as, a noble
edifice.
[1913 Webster]
3. Of exalted rank; of or pertaining to the nobility;
distinguished from the masses by birth, station, or title;
highborn; as, noble blood; a noble personage.
[1913 Webster]
Note: Noble is used in the formation of self-explaining
compounds; as, noble-born, noble-hearted, noble-minded.
[1913 Webster]
Noble gas (Chem.), a gaseous element belonging to group
VIII of the periodic table of elements, not combining with
other elements under normal reaction conditions;
specifically, helium, neon, argon, krypton,
xenon, or radon; also called inert gas.
Noble metals (Chem.), silver, gold, and platinum; -- so
called from their resistance to oxidation by air and to
dissolution by acids. Copper, mercury, aluminium,
palladium, rhodium, iridium, and osmium are sometimes
included.
[1913 Webster]
Syn: Honorable; worthy; dignified; elevated; exalted;
superior; sublime; great; eminent; illustrious;
renowned; stately; splendid; magnificent; grand;
magnanimous; generous; liberal; free.
[1913 Webster] |
Radon
(gcide) | Radon \Ra"don\ (r[=a]"d[o^]n), n. (Chem.)
An intensely radioactive gaseous element produced by the
radioactive decay of radium-226, which is the main isotope of
radium found in pitchblende. Chemically it is an inert noble
gas. Its atomic symbol is Rn. It has an atomic number of 86.
The radon isotope produced by decay of radium has an atomic
weight of 222.017, and this isotope decays by alpha emission
with a half-life of 3.82 days. Numerous other isotopes have
been observed, all radioactive and all having half-lives
shorter than that of radon-222. Radon was discovered by M.
and Mme. Curie, of Paris, in their studies of the radioactive
substances in pitchblende. Radon was originally called
radium emanation or exradio.
[PJC] |
radon
(wn) | radon
n 1: a radioactive gaseous element formed by the disintegration
of radium; the heaviest of the inert gasses; occurs
naturally (especially in areas over granite) and is
considered a hazard to health [syn: radon, Rn, {atomic
number 86}] |
radon
(elements) | radon
Symbol: Rn
Atomic number: 86
Atomic weight: (222)
Colorless radioactive gaseous element, belongs to the noble gases. Of
the
twenty known isotopes, the most stable is Rn-222 with a half-life of 3.8
days.
Formed by the radioactive decay of Radium-226. Radon itself decays
into
polonium. Used in radiotherapy. As a noble gas, it is effectively
inert,
though radon fluoride has been synthesized. First isolated in 1908 by
Ramsey
and Gray.
|
| | podobné slovo | definícia |
radon daughter
(encz) | radon daughter,dceřinný prvek radonu [eko.] RNDr. Pavel Piskač |
dceřinný prvek radonu
(czen) | dceřinný prvek radonu,radon daughter[eko.] RNDr. Pavel Piskač |
Eucalyptus tetradonta
(gcide) | Stringy \String"y\, a.
1. Consisting of strings, or small threads; fibrous;
filamentous; as, a stringy root.
[1913 Webster]
2. Capable of being drawn into a string, as a glutinous
substance; ropy; viscid; gluely.
[1913 Webster]
Stringy bark (Bot.), a name given in Australia to several
trees of the genus Eucalyptus (as {Eucalyptus
amygdalina}, Eucalyptus obliqua, {Eucalyptus
capitellata}, Eucalyptus macrorhyncha, {Eucalyptus
piperita}, Eucalyptus pilularis, & {Eucalyptus
tetradonta}), which have a fibrous bark used by the
aborigines for making cordage and cloth.
[1913 Webster] |
Radon
(gcide) | Noble \No"ble\, a. [Compar. Nobler; superl. Noblest.] [F.
noble, fr. L. nobilis that can be or is known, well known,
famous, highborn, noble, fr. noscere to know. See know.]
1. Possessing eminence, elevation, dignity, etc.; above
whatever is low, mean, degrading, or dishonorable;
magnanimous; as, a noble nature or action; a noble heart.
[1913 Webster]
Statues, with winding ivy crowned, belong
To nobler poets for a nobler song. --Dryden.
[1913 Webster]
2. Grand; stately; magnificent; splendid; as, a noble
edifice.
[1913 Webster]
3. Of exalted rank; of or pertaining to the nobility;
distinguished from the masses by birth, station, or title;
highborn; as, noble blood; a noble personage.
[1913 Webster]
Note: Noble is used in the formation of self-explaining
compounds; as, noble-born, noble-hearted, noble-minded.
[1913 Webster]
Noble gas (Chem.), a gaseous element belonging to group
VIII of the periodic table of elements, not combining with
other elements under normal reaction conditions;
specifically, helium, neon, argon, krypton,
xenon, or radon; also called inert gas.
Noble metals (Chem.), silver, gold, and platinum; -- so
called from their resistance to oxidation by air and to
dissolution by acids. Copper, mercury, aluminium,
palladium, rhodium, iridium, and osmium are sometimes
included.
[1913 Webster]
Syn: Honorable; worthy; dignified; elevated; exalted;
superior; sublime; great; eminent; illustrious;
renowned; stately; splendid; magnificent; grand;
magnanimous; generous; liberal; free.
[1913 Webster]Radon \Ra"don\ (r[=a]"d[o^]n), n. (Chem.)
An intensely radioactive gaseous element produced by the
radioactive decay of radium-226, which is the main isotope of
radium found in pitchblende. Chemically it is an inert noble
gas. Its atomic symbol is Rn. It has an atomic number of 86.
The radon isotope produced by decay of radium has an atomic
weight of 222.017, and this isotope decays by alpha emission
with a half-life of 3.82 days. Numerous other isotopes have
been observed, all radioactive and all having half-lives
shorter than that of radon-222. Radon was discovered by M.
and Mme. Curie, of Paris, in their studies of the radioactive
substances in pitchblende. Radon was originally called
radium emanation or exradio.
[PJC] |
tetradon
(gcide) | Tetrodon \Tet"ro*don\, n. [Tetra- + Gr. ?, ?, tooth.] (Zool.)
Any one of numerous species of plectognath fishes belonging
to Tetrodon and allied genera. Each jaw is furnished with
two large, thick, beaklike, bony teeth. [Written also
tetradon.]
[1913 Webster]
Note: The skin is usually spinous, and the belly is capable
of being greatly distended by air or water. It includes
the swellfish, puffer
(a), and similar species.
[1913 Webster]Tetradon \Tet"ra*don\, n. (Zool.)
See Tetrodon.
[1913 Webster] |
Tetradon
(gcide) | Tetrodon \Tet"ro*don\, n. [Tetra- + Gr. ?, ?, tooth.] (Zool.)
Any one of numerous species of plectognath fishes belonging
to Tetrodon and allied genera. Each jaw is furnished with
two large, thick, beaklike, bony teeth. [Written also
tetradon.]
[1913 Webster]
Note: The skin is usually spinous, and the belly is capable
of being greatly distended by air or water. It includes
the swellfish, puffer
(a), and similar species.
[1913 Webster]Tetradon \Tet"ra*don\, n. (Zool.)
See Tetrodon.
[1913 Webster] |
tetradont
(gcide) | Tetrodont \Tet"ro*dont\, a. (Zool.)
Of or pertaining to the tetrodons. -- n. A tetrodon. [Written
also tetradont, and tetraodont.]
[1913 Webster]Tetradont \Tet"ra*dont\, a. & n. (Zool.)
See Tetrodont.
[1913 Webster] Tetradrachm |
Tetradont
(gcide) | Tetrodont \Tet"ro*dont\, a. (Zool.)
Of or pertaining to the tetrodons. -- n. A tetrodon. [Written
also tetradont, and tetraodont.]
[1913 Webster]Tetradont \Tet"ra*dont\, a. & n. (Zool.)
See Tetrodont.
[1913 Webster] Tetradrachm |
friedrich august kekule von stradonitz
(wn) | Friedrich August Kekule von Stradonitz
n 1: German chemist remembered for his discovery of the ring
structure of benzene (1829-1896) [syn: Kekule, {Friedrich
August Kekule}, Friedrich August Kekule von Stradonitz] |
|