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uranium |
3 definitions found From Webster's Revised Unabridged Dictionary (1913) [web1913]: 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. From WordNet r 1.6 [wn]: uranium n : a heavy toxic silvery-white radioactive metallic element; occurs in many isotopes; used for nuclear fuels and nuclear weapons [syn: {U}, {atomic number 92}] From Elements database 20001107 [elements]: uranium Symbol: U Atomic number: 92 Atomic weight: (231) White radioactive metallic element belonging to the actinoids Three natural isotopes, U-238, U-235 and U-234. Uranium-235 is used as the fuel for nuclear reactors and weapons. Discovered by Martin H. Klaproth in 1789.
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