| 单词 | operculum |
| 释义 | operculum (once / 48243 pages) n WORD FAMILY operculum: opercula USAGE EXAMPLESHe startled periwinkles by tapping them on the operculum, a sort of trapdoor on their shell, and waited. New York Times(Aug 08, 2016) And then just like that, it evaporated into its burrow and slammed its operculum/trap-door closed. Scientific American(Jun 04, 2012) Shell oval, minutely punctured, spire obtuse; margin of the exterior lip within, and base of the inner lip thick and rufous; operculum horny? Swainson, William, Zoological Illustrations, Volume II...(2012) 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 Hyper plate any flat platelike body structure or part |
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