noun, plural o·per·cu·la [oh-pur-kyuh-luh], /oʊˈpɜr kyə lə/, o·per·cu·lums.
- the gill cover of fishes and amphibians.
- (in many gastropods) a horny plate that closes the opening of the shell when the animal is retracted.
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Origin of operculum
OTHER WORDS FROM operculumo·per·cu·lar, adjective
Words nearby operculum
Example sentences from the Web for operculum
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.Form and Function|E. S. (Edward Stuart) Russell
British Dictionary definitions for operculum
noun plural -la (-lə) or -lums
- the hard bony flap covering the gill slits in fishes
- the bony plate in certain gastropods covering the opening of the shell when the body is withdrawn