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Definition of erbium:

  1. A metallic element of the rare earth group, found in gadolinite and some other minerals. Symbol, Er; at. wt. 167. 4. Its salts are rose- colored and give characteristic spectra.
  2. A rare metallic element associated with several other rare elements in the mineral gadolinite from Ytterby in Sweden. Symbol Er. Atomic weight 165. 9. Its salts are rose- colored and give characteristic spectra. Its sesquioxide is called erbia.

Synonyms:

atomic number 68, emergency room, Er.