| 单词 | operculum |
| 释义 | 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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