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Noun: atomic number 65
  1. A metallic element of the rare earth group; used in lasers; occurs in apatite and monazite and xenotime and ytterbite
    "Terbium, atomic number 65, is used in some electronic devices for its fluorescent properties";
    - terbium, Tb

Type of: metal, metallic element

Part of: apatite, gadolinite, monazite, ytterbite