Definitions from Wiktionary (operculum)

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


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