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operculumenUK
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.operculum (əʊˈpɜːkjʊləm) or operculen, pl -la (-lə) or -lums1. (Zoology) zoology a. the hard bony flap covering the gill slits in fishesb. the bony plate in certain gastropods covering the opening of the shell when the body is withdrawn2. (Botany) botany the covering of the spore-bearing capsule of a moss3. (Biology) biology any other covering or lid in various organisms[C18: via New Latin from Latin: lid, from operīre to cover] oˈpercular, operculate, operculated adjo•per•cu•lum (oʊˈpɜr kyə ləm)
n., pl. -la (-lə), -lums. 1. a part or organ serving as a lid or cover, as a covering flap on a seed vessel. 2. the gill cover of fishes and amphibians. [1705–15; < New Latin, Latin: lid, cover] o•per′cu•lar, adj. o·per·cu·lum (ō-pûr′kyə-ləm) A lid or flap covering an opening, such as the gill cover in some fish or the horny flap covering the opening of a snail.Thesaurus| Noun | 1. |  operculum - a hard flap serving as a cover for (a) the gill slits in fishes or (b) the opening of the shell in certain gastropods when the body is retractedplate - any flat platelike body structure or part |
TranslationsoperculumenUK
operculum1. Zoologya. the hard bony flap covering the gill slits in fishes b. the bony plate in certain gastropods covering the opening of the shell when the body is withdrawn 2. Botany the covering of the spore-bearing capsule of a moss 3. Biology any other covering or lid in various organisms Operculum the fold of skin that covers the outside of the gill slits in the majority offish (except the shark and ray) and in the larvae of amphibians, especially tadpoles. The operculum of fish of the class Osteichthyes has bones. In the majority offish the operculum plays an active role in breathing: when it is lifted, a vacuum is created in the gill cavity, and water passes from the mouth and pharyngeal cavities into the gill cavity by way of the gill apparatus. It is possible to determine the age of some fish according to the annual rings on the operculum bones. operculum[ō′pər·kyə·ləm] (anatomy) The soft tissue partially covering the crown of an erupting tooth. That part of the cerebrum which borders the lateral fissure. (biology) A lid, flap, or valve. A lidlike body process. operculumenUK
operculum [o-per´ku-lum] (L.) 1. a lid or covering.2. the folds of pallium from the frontal, parietal, and temporal lobes of the cerebrum overlying the insula. adj., adj oper´cular.dental operculum the hood of gingival tissue overlying the crown of an erupting tooth.trophoblastic operculum the plug of trophoblast that helps close the gap in the endometrium made by the implanting blastocyst.o·per·cu·lum, gen. o·per·cu·li, pl. o·per·cu·la (ō-per'kyū-lŭm, -lī, -lă), 1. Anything resembling a lid or cover. 2. In anatomy, the portions of the frontal (operculum frontale [TA], frontal operculum [TA]), parietal (operculum parietale [TA], parietal operculum [TA]), and temporal (operculum temporale [TA], temporal operculum [TA]) lobes bordering the lateral sulcus and covering the insula. 3. In parasitology, the lid or caplike cover of the shell opening of operculated freshwater snails in the subclass Prosobranchiata, and of the eggs of certain trematode and cestode parasites. 4. The attached flap in the tear of retinal detachment. 5. The mucosal flap partially or completely covering an unerupted tooth. [L. cover or lid, fr. operio, pp. opertus, to cover] operculum (ō-pûr′kyə-ləm)n. pl. opercu·lums or opercu·la (-lə) 1. Something resembling a lid or cover.2. The portions of the frontal, parietal, and temporal lobes covering the insula.3. A bit of mucus sealing the endocervical canal of the uterus after conception.4. The attached flap in cases of torn retinal detachment.
o·per′cu·lar (-lər) adj.o·per·cu·lum, pl. opercula (ō-pĕr'kyū-lŭm, -lă) [TA] 1. Anything resembling a lid or cover. 2. [TA] anatomy The portions of the frontal, parietal, and temporal lobes bordering the lateral sulcus and covering the insula. 3. Mucus sealing the endocervical canal of the uterus after conception has taken place. 4. parasitology The lid or caplike cover of the shell opening of operculated freshwater snails in the subclass Prosobranchiata, and of the eggs of certain trematode and cestode parasites. 5. The attached flap in the tear of retinal detachment. 6. The mucosal flap partially or completely covering a partially erupted tooth. [L. cover or lid, fr. operio, pp. opertus, to cover]operculum A covering membrane, flap or lid of tissue, especially in the brain, or over an erupting tooth.operculum - the lid of a MOSS capsule.
- a hard bony flap covering the gills of fishes.
- the plate of exoskeletal material on the foot of a gastropod mollusc with which it closes off the entrance to the shell.
operculum A flap of detached retina which projects forward, or is totally free in the vitreous. It can happen as a result of a retinal tear (break).o·per·cu·lum, pl. opercula (ō-pĕr'kyū-lŭm, -lă) [TA] 1. [TA] The mucosal flap partially or completely covering an unerupted tooth. 2. Anything resembling a lid or cover. [L. cover or lid, fr. operio, pp. opertus, to cover]operculumenUK
Words related to operculumnoun a hard flap serving as a cover for (a) the gill slits in fishes or (b) the opening of the shell in certain gastropods when the body is retractedRelated Words |