Толковый словарь английского языка Oxford English Reference - operculum
Operculum
operculum
n. (pl. opercula) 1 Zool. a a flaplike structure covering the gills in a fish. b a platelike structure closing the aperture of a gastropod mollusc's shell when the organism is retracted. c any of various other parts covering or closing an aperture, such as a flap over the nostrils in some birds. 2 Bot. a lidlike structure of the spore-containing capsule of mosses. Derivatives opercular adj. operculate adj. operculi- comb. form. Etymology: L f. operire cover
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1.
noun (plural opercula; also -lums) Etymology: New Latin, from Latin, cover, from operire to shut, cover Date: 1681 a body process or part that suggests a lid: as, a horny or shelly plate on the posterior dorsal surface of the foot in many gastropod mollusks that closes the shell when the animal is retracted, the covering of the gills of a fish, a lid or covering flap (as of a moss capsule) ...Толковый словарь английского языка
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