Terbium

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The American Heritage® Dictionary of the English Language, 4th Edition
  • n. A soft, silvery-gray metallic rare-earth element, used in x-ray and color television tubes. Atomic number 65; atomic weight 158.925; melting point 1,356°C; boiling point 3,123°C; specific gravity 8.229; valence 3, 4. See Table at element.
  • Wiktionary, Creative Commons Attribution/Share-Alike License
  • n. a metallic chemical element (symbol Tb) with an atomic number of 65
  • the GNU version of the Collaborative International Dictionary of English
  • n. 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.
  • The Century Dictionary and Cyclopedia
  • n. A rare element, not yet isolated, occurring in the samarskite of North Carolina and certain other rare minerals, associated with erbium and yttrium.
  • WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
  • n. a metallic element of the rare earth group; used in lasers; occurs in apatite and monazite and xenotime and ytterbite
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