GNU Collaborative International Dictionary of English

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1.       
   Terbium (?), n. [NL., fr. Ytterby, in Sweden. See Erbium.] (Chem.) A rare metallic element, found in certain minerals, as gadolinite and samarskite, with other rare earths such as ytterbium. Symbol Tb. Atomic number 65. Atomic weight 158.925.
   
   [1913 Webster +PJC]