Definitions for operculumoʊˈpɜr kyə ləm
Random House Webster's College Dictionary
o•per•cu•lumoʊˈpɜr kyə ləm(n.)(pl.)-la; -lums.
a part or organ serving as a lid or cover, as a covering flap on a seed vessel.
Category: Botany, Zoology
the gill cover of fishes and amphibians.
Origin of operculum:
1705–15; < NL, L: lid, cover
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
A covering flap or lidlike structure in plants and animals, such as a gill cover
Origin: From operire.