Definition & Meaning | English word OPERCULUM

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Definitions of OPERCULUM

1. A structure which serves as a cover or lid.
2. (zoology) A covering flap in animals, such as a gill cover.
3. (botany) The lidlike portion of a moss sporangium or of a fruit that detaches to allow the dispersal of spores or seeds.
4. (dentistry) A gum flap covering (part of) a partially erupted tooth, usually a wisdom tooth.
5. (anatomy) One of several flaps of cerebral cortex covering the insula.

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Examples of Using OPERCULUM in a Sentence

• They have a bony skeleton, are generally laterally flattened, have five pairs of gills protected by an operculum, and a mouth at or near the tip of the snout.
• Taste: The primary gustatory area consists of the anterior part of the insula and the frontal operculum.
• The prosobranch gastropods include the majority of marine snails, among them conches, cones, cowries, limpets, murexes, periwinkles, volutes and whelks, as well as numerous freshwater groups, and some land snails with an operculum.
• The shells of Limacina are well developed, sinistrally coiled, turret-like, and include an operculum.
• Unlike in Eucalyptus and Corymbia, the petals and sepals are not fused to form a cap-like operculum.
• The species may show red spotting and a blueish green dorsal overcast when mature and when aroused exhibits a black operculum spot.
• The narrow shell aperture, which is ovate and pointed on the top, can be closed with a corneous operculum.
• It includes the study of land and freshwater mollusc shells as well as seashells and extends to the study of a gastropod's operculum.
• The operculum is corneous and of variable thickness, with the nucleus near the anterior end or at about midlength of the outer margin.
• Adults have striae on their operculum that aid in distinguishing Thaleichthys pacificus from other smelt.
• Ostracoderms had separate pharyngeal gill pouches along the side of the head, which were permanently open with no protective operculum.
• Some writers believe that onycha was Unguis odoratus, the fingernail-like operculum, or trap door, of certain sea snails, such as Strombus lentiginosus, Murex anguliferus, and Onyx marinus.
•  gigas is similar to that of other snails in the family Strombidae; it has a long snout, two eyestalks with well-developed eyes, additional sensory tentacles, a strong foot and a corneous, sickle-shaped operculum.
• This can occasionally lead to self-pollination, although the stigma does not become receptive until a few days after the operculum has been detached by the expanding stamens, and the flower's pollen has already been released.
• Mature buds are top-shaped to conical, glaucous or green, with a flattened hemispherical, warty operculum with a central knob.
• The common periwinkle or winkle (Littorina littorea) is a species of small edible whelk or sea snail, a marine gastropod mollusc that has gills and an operculum, and is classified within the family Littorinidae, the periwinkles.
• The wild-type of the species has 8 or 9 black vertical bars on a blue-grey body, along with a dark blotch on the operculum.
• A 2010 review of the genus by Gonez and Gerrienne produced a tighter definition, which requires the sporangia to be more-or-less trumpet-shaped (as in the illustration), with a 'lid' or operculum which disintegrates to release the spores.
• Marisa cornuarietis, common name the Colombian ramshorn apple snail, is a species of large freshwater snail with an operculum, an aquatic gastropod mollusc in the family Ampullariidae, the apple snail family.
• The buds are often longitudinally striated and scarred, with a rounded operculum, inflexed stamens and cuboid to oblong anthers.

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