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 lid of a pitcherform leaf.
Noun
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
n.
The lid of a pitcherform leaf.
n.
The lid of the urnlike capsule of mosses.
n.
Any lidlike or operculiform process or part; as, the
opercula of a dental follicle.
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.
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.
Operculum
The lid of a pitcherform leaf.
Usage Examples
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