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Operculum

/ōˈpərkyələm/ Noun, pl. opercula 1. A covering flap or lidlike structure in plants and animals, such as a gill cover. (wiktionary.org) 2. A lid or cover becoming detached at maturity by abscission, in eucalyptus (for example), a cap covering the bud and formed by fusion or cohesion of perianth parts. (biology-online.org) (Human Anatomy) (wikipedia.org) 1. (In pregnancy), the cervical mucus plug that blocks the cervix of the uterus after conception. 2. (Brain), the part of the brain covering the insula. 3. (Dentistry), a small flap of tissue which may cover an erupting or partially erupted molar. (Animal Biology) (wikipedia.org) 1. (Animal), a structure resembling a lid or a small door that opens and closes. 2. (Fish), a flap of the bony fish covering the gills. 3. (Gastropod), a lid on the shell of some gastropods. 4. (Bird), a structure which covers the nares of some birds. 5. (Bryozoa), a lid on the orifice of some bryozoans. 6. The anterior end of the fruit fly puparium, through which the adult fly emerges. (Botany) (wikipedia.org) 1. Various lids and flaps pertaining to plants, algae and fungi. Word origin: From Latin operculum “cover, lid,” from operire “to cover,...

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Ophthalmic

/äfˈTHalmik/  /äp-/ Adjective 1. Of or pertaining to the eyes and its diseases. (Google Dictionary) 2. Supplying or draining the eye or structures in the region of the eye. (merriam-webster.com) Syn: ocular Word origin: From Latin ophthalmicus, from Greek ophthalmikos “pertaining to the eye,” from ophthalmos...

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Optic

/ˈäptik/ Adjective 1. Of, or relating to the eye or to vision. (wiktionary.org) 2. Of, or relating to optics or optical instruments. (wiktionary.org) Noun 1. (now humorous) An eye. (wiktionary.org) 2. A lens or other part of an optical instrument that interacts with light. (wiktionary.org) 3. A measuring device with a small window, attached to an upside-down bottle, used to dispense alcoholic drinks in a bar. (wiktionary.org) Word origin: From Middle French optique, obtique (c.1300) and directly from Medieval Latin opticus “of sight or seeing,” from Greek optikos “of or having to do with sight,” from optos “seen, visible,” from op-, root of opsesthai “be going to see,” related to ops...

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Optic

/ˈäptik/ Adjective 1. Of, or relating to the eye or to vision. (wiktionary.org) 2. Of, or relating to optics or optical instruments. (wiktionary.org) Noun 1. A lens or other optical component in an optical instrument. (Google Dictionary) 2. The eye. (Google Dictionary) Word origin: From Medieval Latin opticus “of sight or seeing,” from Greek optikos “of or having to do with sight,” from optos “seen, visible,” from op-, root of opsesthai “be going to see,” related to ops...

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