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Noun: erbium  ur-bee-um
  1. A trivalent metallic element of the rare earth group; occurs with yttrium
    "Erbium is used to colour glass and ceramics";
    - Er, atomic number 68

Derived forms: erbiums

Type of: metal, metallic element

Part of: fergusonite, gadolinite, ytterbite

Encyclopedia: Erbium