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English Dictionary: Operculum by the DICT Development Group
2 results for Operculum
From WordNet (r) 3.0 (2006) [wn]:
operculum
n
  1. a hard flap serving as a cover for (a) the gill slits in fishes or (b) the opening of the shell in certain gastropods when the body is retracted
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
   Operculum \O*per"cu*lum\, n.; pl. L. {Opercula}, E.
      {Operculums}. [L., a cover or lid, fr. operire to cover.]
      1. (Bot.)
            (a) The lid of a pitcherform leaf.
            (b) The lid of the urnlike capsule of mosses.
  
      2. (Anat.)
            (a) Any lidlike or operculiform process or part; as, the
                  opercula of a dental follicle.
            (b) The fold of integument, usually supported by bony
                  plates, which protects the gills of most fishes and
                  some amphibians; the gill cover; the gill lid.
            (c) The principal opercular bone in the upper and
                  posterior part of the gill cover.
  
      3. (Zo[94]l.)
            (a) The lid closing the aperture of various species of
                  shells, as the common whelk. See Illust. of
                  {Gastropoda}.
            (b) Any lid-shaped structure closing the aperture of a
                  tube or shell.
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