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opercularenUK
o·per·cu·lum O0094300 (ō-pûr′kyə-ləm)n. pl. o·per·cu·la (-lə) or o·per·cu·lums Biology A lidlike structure covering an opening, especially:a. A bony plate that covers and protects the gills of most bony fishes. Also called gill cover.b. A horny or calcareous plate attached to the foot of most larval and many adult gastropods, used to close the aperture when the animal retracts into its shell.c. A covering at the top of the spore capsule of most mosses, falling off when mature spores are released.
[Latin, lid, from operīre, to cover; see wer- in Indo-European roots.]
o·per′cu·lar (-lər) adj.EncyclopediaSeeoperculumopercularenUK
o·per·cu·lar (ō-per'kyū-lăr), Relating to an operculum.o·per·cu·lar (ō-pĕr'kyū-lăr) Relating to an operculum. operculum (ō-pĕr′kū-lŭm) plural.opercula [L., a cover] 1. Any lid or covering. 2. The narrow opening at the top of the thoracic cage bordered by the sternum and first ribs. 3. The plug of mucus that fills the opening of the cervix on impregnation.4. The convolutions of the cerebrum, the margins of which are separated by the lateral cerebral (sylvian) fissure. The opercula cover the insula. opercular (ō-pĕr′kū-lăr), adjectivedental operculumThe soft tissue overlying the crown of a partially erupted tooth.trophoblastic operculumThe plug of fibrin that covers the opening in the endometrium made by implantation of the blastocyst. |