From The Collaborative International Dictionary of English v.0.48:

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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