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operculum |
2 definitions found From Webster's Revised Unabridged Dictionary (1913) [web1913]: Operculum \O*per"cu*lum\, n.; pl L. {Opercula}, E. {Operculums}. [L., a cover or lid, fr operire to cover.] 1. (Bot.) a The lid of a pitcherform leaf. b The lid of the urnlike capsule of mosses. 2. (Anat.) a Any lidlike or operculiform process or part as the opercula of a dental follicle. b 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. c The principal opercular bone in the upper and posterior part of the gill cover. 3. (Zo["o]l.) a The lid closing the aperture of various species of shells, as the common whelk. See Illust. of {Gastropoda}. b Any lid-shaped structure closing the aperture of a tube or shell. From WordNet r 1.6 [wn]: operculum 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
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