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The lid of a pitcherform leaf.

The postero-inferior opercular bone, in fishes.

Same as Preoperculum. -- Præ`o*per"cu*lar, a.

The anterior opercular bone in fishes.

The lower opercular bone in fishes.

A small, lenticular, calcareous body, esp. an operculum of a small shell of the family Tubinid, used to remove a foreign sub stance from the eye. It is rut into the inner corner of the eye under the lid, and allowed to work its way out at the outer corner, bringing with the substance.

fts. (Anat.) Same as Branchial clefts. See under Branchial. -- Gill cover, Gill lid. See Operculum. -- Gill frame, or Gill head (Flax Manuf.), a spreader; a machine for subjecting flax to the action of gills. Knight. -- Gill net, a flat net so suspended in the water that its meshes allow the heads of fish to pass, b…

Having no operculum; -- said of certain gastropod shells.

Of or pertaining to the interoperculum. -- n.

The central part around which additional growths are added, as of an operculum.

An ingredient of the Mosaic incense, probably the operculum of some kind of strombus. Ex. xxx. 34.

An operculum.

See Operculum.

Of, pertaining to, or like, an operculum.

Having an operculum, or an apparatus for protecting the gills; -- said of shells and of fishes.

Bearing an operculum.

Producing an operculum; -- said of the foot, or part of the foot, of certain mollusks.

Having few spirals, or whorls; as, a paucispiral operculum or shell.

Situated in front of the operculum; pertaining to the preoperculum. -- n.

sion 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.