 3 definitions found
From WordNet (r) 2.0 [wn]:
uranium
noun: 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 The Collaborative International Dictionary of English v.0.44 [gcide]:
Uranium \U*ra"ni*um\, noun [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.
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 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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