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In biology, 'operculum' (Latin for "little lid") has been used to describe several different anatomical features, in animals, in humans and even in plants. The following list gives some of the uses of the term:

★ Operculum (gastropod), a lid on the shell of some gastropods.

★ Operculum (incense ingredient), made from the operculum of gastropods.

★ Operculum (fish), a flap of the bony fish covering the gills.

★ Operculum (botany), various lids and flaps pertaining to plants and fungi.

★ Operculum (brain), a part of the (human) brain.

★ Operculum (dentistry), A small flap of tissue covering the back molars