Terbium
Pronunciation : Ter"bi*um
Part of Speech : n.
Etymology : [NL., fr. Ytterby, in Sweden. See Erbium.] (Chem.)
Definition : Defn: 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.
Source : Webster's Unabridged Dictionary, 1913