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operculum

operculum
1. (in zoology) A lid or flap of skin covering an aperture, such as the gill slit cover of fish and larval amphibians and the horny calcareous operculum secreted by many gastropod molluscs, which closes the opening of the shell when the animal is inside.

2. (in botany) The cone-shaped lid of the capsule of mosses, which is forcibly detached to release the spores.

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"operculum." A Dictionary of Biology. . Encyclopedia.com. 17 Oct. 2017 <http://www.encyclopedia.com>.

"operculum." A Dictionary of Biology. . Encyclopedia.com. (October 17, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/operculum-2

"operculum." A Dictionary of Biology. . Retrieved October 17, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/operculum-2

operculum

operculum (oh-per-kew-lŭm) n. (pl. opercula) a plug of mucus that blocks the cervical canal of the uterus in a pregnant woman. When the cervix begins to dilate at the start of labour, the operculum, slightly stained with blood, comes away as a discharge (‘show’).

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"operculum." A Dictionary of Nursing. . Encyclopedia.com. 17 Oct. 2017 <http://www.encyclopedia.com>.

"operculum." A Dictionary of Nursing. . Encyclopedia.com. (October 17, 2017). http://www.encyclopedia.com/caregiving/dictionaries-thesauruses-pictures-and-press-releases/operculum

"operculum." A Dictionary of Nursing. . Retrieved October 17, 2017 from Encyclopedia.com: http://www.encyclopedia.com/caregiving/dictionaries-thesauruses-pictures-and-press-releases/operculum

operculum

operculum
1. In animals, a lid or cover, sometimes hinged, occurring, for example, in some cylindrical rugose corals, some bryozoans, and in gastropods.

2. A flap of skin covering the gills in bony fish (Osteichthyes).

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"operculum." A Dictionary of Earth Sciences. . Encyclopedia.com. 17 Oct. 2017 <http://www.encyclopedia.com>.

"operculum." A Dictionary of Earth Sciences. . Encyclopedia.com. (October 17, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/operculum

"operculum." A Dictionary of Earth Sciences. . Retrieved October 17, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/operculum

operculum

operculum (pl. opercula) A little lid or cover. In Prosobranchia, a rounded, horny or calcareous plate, carried on the foot, that closes the aperture when the animal withdraws into its shell. See also GILL COVER.

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"operculum." A Dictionary of Zoology. . Encyclopedia.com. 17 Oct. 2017 <http://www.encyclopedia.com>.

"operculum." A Dictionary of Zoology. . Encyclopedia.com. (October 17, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/operculum-1

"operculum." A Dictionary of Zoology. . Retrieved October 17, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/operculum-1

operculum

operculum A little lid. In plants, the term usually refers to the dehiscent cap present on certain moss capsules or other types of sporangia.

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"operculum." A Dictionary of Plant Sciences. . Encyclopedia.com. 17 Oct. 2017 <http://www.encyclopedia.com>.

"operculum." A Dictionary of Plant Sciences. . Encyclopedia.com. (October 17, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/operculum-0

"operculum." A Dictionary of Plant Sciences. . Retrieved October 17, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/operculum-0

operculum

operculum (zool., etc.) cover. lid. XVIII. — L., f. operīre cover, close, parallel formation to aperīre open; see -CULE.

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"operculum." The Concise Oxford Dictionary of English Etymology. . Encyclopedia.com. 17 Oct. 2017 <http://www.encyclopedia.com>.

"operculum." The Concise Oxford Dictionary of English Etymology. . Encyclopedia.com. (October 17, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/operculum

"operculum." The Concise Oxford Dictionary of English Etymology. . Retrieved October 17, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/operculum