terbic

WordReference Random House Unabridged Dictionary of American English © 2026

ter•bi•um  (tûr′bē əm), n. [Chem.]

1. Chemistry 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.

• (Yt)terb(y), name of Swedish town where found + -ium. See ytterbium 1835–45

ter′bic, adj.