operculum operculum

Definition(s):

  • (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

Usage(s):

  • The trochus or top shell is a marine rhipidoglossate mollusk with a multispiral operculum.
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ennui ennui
/ɛ ˈnu i /