U*ra"ni*um(?), n. [NL., from Uranus the planet. See Uranus.] (Chem.) An element of the chromium group, found in certain rare minerals, as pitchblende, uranite, etc., and reduced as a heavy, hard, nickel-white metal which is quite permanent. Its yellow oxide is used to impart to glass a delicate greenish-yellow tint which is accompanied by a strong fluorescence, and its black oxide is used as a pigment in porcelain painting. Symbol U. Atomic weight 239.
Uranium was discovered in the state of an oxide by Klaproth in 1789, and so named in honor of Herschel's discovery of the planet
Uranus in 1781.
U"ran-o`chre} (?), n. [Cf. F. uranochre.] (Min.) (a) A yellow, earthy incrustation, consisting essentially of the oxide of uranium, but more or less impure.
U`ra*no*graph"ic*al(?), } a. Of or pertaining to uranography; as, an uranographic treatise.
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