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5 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 ura·ni·um /jʊˈreniəm/

From: DICT.TW English-Chinese Medical Dictionary 英漢醫學字典

 ura·ni·um /jʊˈrenɪəm/ 名詞

From: Webster's Revised Unabridged Dictionary (1913)

 U·ra·ni·um n.  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.
 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.

From: WordNet (r) 2.0

      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

 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.