Uranium

n.

1.

(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. <-radioactive, U-235 isotope is used in atomic fission, in bombs or power plants ->

Noun

1.

uranium - a heavy toxic silvery-white radioactive metallic element; occurs in many isotopes; used for nuclear fuels and nuclear weapons Synonyms: atomic number 92, U

atomic number 92, metal, metallic element, pitchblende, U, uraninite, uranium 235, uranium 238