ura·ni·um /jʊˈreniəm/
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 ura·ni·um /jʊˈrenɪəm/ 名詞
 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.
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 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]
 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.