Definition of operculum

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Operculum (n.) The principal opercular bone in the upper and posterior part of the gill cover.

Lern More About Operculum

Operculiferous :: Operculiferous (a.) Bearing an operculum.
Turritella :: Turritella (n.) Any spiral marine gastropod belonging to Turritella and allied genera. These mollusks have an elongated, turreted shell, composed of many whorls. They have a rounded aperture, and a horny multispiral operculum..
Eyestone :: Eyestone (n.) A small, lenticular, calcareous body, esp. an operculum of a small marine shell of the family Turbinidae, used to remove a foreign substance from the eye. It is put into the inner corner of the eye under the lid, and allowed to work its way out at the outer corner, bringing with it the substance..
Paucispiral :: Paucispiral (a.) Having few spirals, or whorls; as, a paucispiral operculum or shell..
Turbo :: Turbo (n.) Any one of numerous marine gastropods of the genus Turbo or family Turbinidae, usually having a turbinate shell, pearly on the inside, and a calcareous operculum..
Opercula :: Opercula (n. pl.) See Operculum.
Operculum :: Operculum (n.) Any lid-shaped structure closing the aperture of a tube or shell.
Tergum :: Tergum (n.) One of the dorsal plates of the operculum of a cirriped.
Operculum :: Operculum (n.) The lid of a pitcherform leaf.
Interpercular :: Interpercular (a.) Of or pertaining to the interoperculum.
Operculum :: Operculum (n.) The lid closing the aperture of various species of shells, as the common whelk. See Illust. of Gastropoda..
Serpula :: Serpula (n.) Any one of numerous species of tubicolous annelids of the genus Serpula and allied genera of the family Serpulidae. They secrete a calcareous tube, which is usually irregularly contorted, but is sometimes spirally coiled. The worm has a wreath of plumelike and often bright-colored gills around its head, and usually an operculum to close the aperture of its tube when it retracts..
Nucleus :: Nucleus (n.) The central part around which additional growths are added, as of an operculum..
Scutum :: Scutum (n.) One of the two lower valves of the operculum of a barnacle.
Operculum :: Operculum (n.) The lid of the urnlike capsule of mosses.
Rostellum :: Rostellum (n.) A small beaklike process or extension of some part; a small rostrum; as, the rostellum of the stigma of violets, or of the operculum of many mosses; the rostellum on the head of a tapeworm..
Preopercular :: Preopercular (n.) The preoperculum.
Operculigenous :: Operculigenous (a.) Producing an operculum; -- said of the foot, or part of the foot, of certain mollusks..
Preopercular :: Preopercular (a.) Situated in front of the operculum; pertaining to the preoperculum.
Subopercular :: Subopercular (a.) Situated below the operculum; pertaining to the suboperculum.
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