Dictionary![]() ![]() u•ran•i•nitePronunciation: (yoo-ran'u-nīt", -rā'nu-), [key] —n. a mineral, probably originally uranium dioxide, UO2, but altered by radioactive decay, and usually containing uranium trioxide, lead, radium, and helium, occurring in several varieties, including pitchblende: the most important ore of uranium. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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