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uranium 音標拼音: [jɚ'eniəm] n. 鈾 鈾 uranium n 1: a heavy toxic silvery- white radioactive metallic element; occurs in many isotopes; used for nuclear fuels and nuclear weapons [ synonym: { uranium}, { U}, { atomic number 92}] Uranium \ 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. [ 1913 Webster] Note: 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. [ 1913 Webster] Uran- ocher
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