Dictionary
ter•bi•um
Pronunciation: (tûr'bē-um), [key]—
n. Chem.
a rare-earth, metallic element present in certain minerals and yielding colorless salts.
Symbol: Tb;
at. no.: 65;
at. wt.: 158.924;
sp. gr.: 8.25.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.