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. [1913 Webster]

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. [1913 Webster]

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. [1913 Webster]

The Collaborative International Dictionary of English. 2000.

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Look at other dictionaries:

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  • opercula — n. body part which serves as a covering (Anatomy, Botany, and Zoology)o·per·cu·lum || əʊ pÉœrkjÉ™lÉ™m /É’ pɜːkjÊŠ …   English contemporary dictionary

  • Пробка (Operculum, Множ. Opercula) — 1. Слизистая пробка, которая перекрывает канал шейки матки у беременных женщин. Когда в начале родов шейка матки начинает расширяться, эта пробка (она также содержит в своем составе примесь крови) удаляется из организма женщины. 2. В эмбриологии… …   Медицинские термины

  • ossa opercula — plural of os operculum …   Dictionary of ichthyology

  • pupillary opercula — the irregular lobe(s) of the upper iris which permit it to decrease the size of the pupil by extending the lobes, giving the pupil an irregular shape. May shade or camouflage the eye, e.g. Ogcocephalus, Halieutichthys (Ogcocephalidae); Raja… …   Dictionary of ichthyology

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