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plural opercula
(zoology) A covering flap in animals, such as a gill cover. quotations
Hyoliths […] have a small, conical calcium carbonate shell, with a lid called an operculum.
2017 January 18, Susannah Lydon, The Guardian
(botany) The lidlike portion of a moss sporangium or of a fruit that detaches to allow the dispersal of spores or seeds. examples
(dentistry) A gum flap covering (part of) a partially erupted tooth, usually a wisdom tooth. examples
A structure which serves as a cover or lid. quotations examples
I lifted the circular operculum from its place and laid it carefully on the bale.
1900 December – 1901 August, H[erbert] G[eorge] Wells, chapter IX, in The First Men in the Moon, London: George Newnes, […], published 1901, page 95
(anatomy) One of several flaps of cerebral cortex covering the insula. (clarification of this definition is needed) examples