1. Noun
The lid of a pitcherform leaf.
2. Noun
The lid of the urnlike capsule of mosses.
3. Noun
Any lidlike or operculiform process or part; as, the opercula of a dental follicle.
4. Noun
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.
5. Noun
The principal opercular bone in the upper and posterior part of the gill cover.
6. Noun
The lid closing the aperture of various species of shells, as the common whelk. See Illust. of Gastropoda.
7. Noun
Any lid-shaped structure closing the aperture of a tube or shell.
8. 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
Vocabulary classified under Nature and environment
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