operculum 的定义
plural o·per·cu·la [oh-pur-kyuh-luh], /oʊˈpɜr kyə lə/, o·per·cu·lums.
- Botany, Zoology. a part or organ serving as a lid or cover, as a covering flap on a seed vessel.
- Zoology. the gill cover of fishes and amphibians. a horny plate that closes the opening of the shell when the animal is retracted.
更多operculum例句
- Operculum semi-lunar, orange, with a projection which serves as a lock to keep the operculum in position.
- Operculum made of plates rising one above another formed at different stages of growth.
- The operculum, like the shell itself, often exhibits distinct lines of growth which display the manner in which it was built up.
- These fishes generally have an air-bladder, and the gills lie close together in a cavity covered by an operculum.
- These are the bones connected with respiration—the operculum, the branchiostegal rays, the branchial arches, and others.