Dictionary
thu•li•um
Pronunciation: (thOO'lē-um), [key]—
n. Chem.
a rare-earth metallic element found in the minerals euxenite, gadolinite, etc.
Symbol: Tm;
at. wt.: 168.934;
at. no.: 69;
sp. gr.: 9.32.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.