operculum definition

  • noun:
    • A lid or flap addressing an aperture, including the gill cover in a few fishes or the horny shell address in snails or any other mollusks.
    • A covering flap or lidlike structure in plants and animals, like a gill address
    • The cover of a pitcherform leaf.
    • The lid of urnlike pill of mosses.
    • Any lidlike or operculiform process or part.
    • The fold of integument, usually supported by bony plates, which shields the gills of most fishes plus some amphibians; the gill address; the gill lid.
    • The principal opercular bone in upper and posterior the main gill address.
    • The lid shutting the aperture of various species of shells, while the common whelk. See Illust. of Gastropoda.
    • Any lid-shaped structure closing the aperture of a tube or layer.
    • A lid or address; in all-natural record, a part, organ, or structure which types a lid, flap, or cover.
    • a difficult flap offering as a cover for (a) the gill slits in fishes or (b) the opening of layer using gastropods once the human anatomy is retracted

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