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n. A lid or flap covering an aperture, such as the gill cover in some fishes or the horny shell cover in snails or other mollusks.

n. A covering flap or lidlike structure in plants and animals, such as a gill cover

n.

n. The lid of a pitcherform leaf.

n. The lid of the urnlike capsule of mosses.

n.

n. Any lidlike or operculiform process or part.

n. 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.

n. The principal opercular bone in the upper and posterior part of the gill cover.

n.

n. The lid closing the aperture of various species of shells, as the common whelk. See Illust. of Gastropoda.

n. Any lid-shaped structure closing the aperture of a tube or shell.

n. A lid or cover; in natural history, a part, organ, or structure which forms a lid, flap, or cover.

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

"The snail in the middle with the aperture of its shell sealed with an operculum is Pomatias elegans."

plate   

muricoid operculum    genital operculum    occipital operculum   

opercula    Gastropoda   

infundibuliform    lobule    kamae    lobotomy    clay-slate    pericardium    zeolite    pleura    lignum    rehydration