Operculum
From BiblePortal Wikipedia
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.
