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Short "hint"

n. - 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.

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Usage examples (38)
  • The snail in the middle with the aperture of its shell sealed with an operculum is Pomatias elegans.
  • In the case of P. elegans, the foot has to come out first to move the operculum, which is attached to the foot, out of the way.
  • Ammonites had an operculum (pl. opercula) as well.
  • I've lost track. is a pulmonate family with an operculum.
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