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terbium |
3 definitions found From Webster's Revised Unabridged Dictionary (1913) [web1913]: Terbium \Ter"bi*um\, n. [NL., fr Ytterby in Sweden. See {Erbium}.] (Chem.) 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. From WordNet r 1.6 [wn]: terbium n : a metallic element of the rare earth group used in lasers; occurs in apatite and monazite and xenotime and ytterbite [syn: {Tb}, {atomic number 65}] From Elements database 20001107 [elements]: terbium Symbol: Tb Atomic number: 65 Atomic weight: 158.924 Silvery metallic element belonging to the lanthanoids. Tb-159 is the only stable isotope, there are seventeen artificial isotopes. Discovered by G.G. Mosander in 1843.
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