Dictionary![]() ![]() thu•li•aPronunciation: (thOO'lē-u), [key] —n. Chem. a dense, greenish-white powder, TmO3, that on gentle heating exhibits a reddish incandescence: used in the manufacture of thulium metal. Also called thu'lium ox'ide. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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