earpiece - definition and synonyms

noun [countable] 

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/ˈɪə(r)ˌpiːs/
singularearpiece
pluralearpieces
  1. 1
    a small piece of electronic equipment that you put in your ear in order to listen to something, especially recorded music
    1. a.
      the part of an old-fashioned telephone receiver that you put to your ear and listen to
  2. 2
    one of the parts of a pair of glasses that fits over your ears