thulium Hear it!

thulium definition

thu·lium (t̸ho̵̅o̅′lē əm, t̸hyo̵̅o̅′-)

noun

a bright, silvery chemical element, one of the rare-earth elements: symbol, Tm; at. no., 69

Etymology: ModL: so named (1886) by L. de Boisbaudran (see gadolinium) < thulia (from which it was isolated by Cleve in 1879) + -ium

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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