Operculum
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Operculum [1]
(1):
(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.
(2):
(n.) Any lid-shaped structure closing the aperture of a tube or shell.
(3):
(n.) The lid closing the aperture of various species of shells, as the common whelk. See Illust. of Gastropoda.
(4):
(n.) The principal opercular bone in the upper and posterior part of the gill cover.
(5):
(n.) The lid of a pitcherform leaf.
(6):
(n.) Any lidlike or operculiform process or part; as, the opercula of a dental follicle.
(7):
(n.) The lid of the urnlike capsule of mosses.