Source : Webster's Revised Unabridged Dictionary (1913)

Opercle \O"per*cle\, n. [Cf.F. opercule. See {Operculum}.]
   1. (Anat.) Any one of the bony plates which support the gill
      covers of fishes; an opercular bone.

   2. (Zo["o]l.) An operculum.