Princeton's WordNet

1. uranium, U, atomic number 92(noun)

   a heavy toxic silvery-white radioactive metallic element; occurs in many isotopes; used for nuclear fuels and nuclear weapons

Wiktionary

1. uranium(Noun)

   The element with atomic number 92 and symbol U.

Origin: After Uranus (the planet).

Webster Dictionary

1. Uranium(noun)

   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.

U.S. National Library of Medicine

1. Uranium

   Uranium. A radioactive element of the actinide series of metals. It has an atomic symbol U, atomic number 92, and atomic weight 238.03. U-235 is used as the fissionable fuel in nuclear weapons and as fuel in nuclear power reactors.

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