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An operculum is a small covering or lid, and is widely used in descriptions of animals and plants.

Operculum may refer to:

In human biology:

  • Operculum (in pregnancy), the cervical mucus plug that blocks the cervix of the uterus after conception
  • Operculum (brain), the part of the brain covering the insula
  • Operculum (dentistry), a small flap of tissue which may cover an erupting or partially erupted molar

In animal biology:

In botany:

See also[edit]

  • Dehiscence (botany), the opening of a plant structure, such as a fruit, anther, or sporangium, to release its contents. This sometimes involves an operculum.