Terbium

[tә:biәm]

Definition

(noun.) a metallic element of the rare earth group; used in lasers; occurs in apatite and monazite and xenotime and ytterbite.

Checker: Mara--From WordNet

Definition

(n.) A rare metallic element, of uncertain identification, supposed to exist in certain minerals, as gadolinite and samarskite, with other rare ytterbium earth. Symbol Tr or Tb. Atomic weight 150.

Checked by Lemuel

Definition

n. a rare metal found in certain yttrium minerals.—adj. Ter′bic.

Inputed by Harlow