| 单词 | operculum |
| 释义 | operculum —opercular, adj. /oh perr"kyeuh leuhm/, n. , pl. opercula /-leuh/, operculums. 1. Bot. , Zool. a part or organ serving as a lid or cover, as a covering flap on a seed vessel. 2. Zool. a. the gill cover of fishes and amphibians. See diag. under fish. b. (in many gastropods) a horny plate that closes the opening of the shell when the animal is retracted. [1705-15; < NL, L: lid, cover, equiv. to oper(ire) to cover + -culum -CULE2] |
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