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.