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operculum.

A covering flap in animals and insects, such as a gill cover or the lid of nits.

9 characters4 syllables approx.English language

Meaning & usage

noun/əʊˈpɜː.kjʊ.ləm/UK/oʊˈpɝ.kjə.ləm/US
  1. A covering flap in animals and insects, such as a gill cover or the lid of nits.

  2. The lidlike portion of a moss sporangium or of a fruit that detaches to allow the dispersal of spores or seeds.

  3. A gum flap covering (part of) a partially erupted tooth, usually a wisdom tooth.

  4. A structure which serves as a cover or lid.

  5. One of several flaps of cerebral cortex covering the insula.

Where this word comes from

Etymology tree Proto-Indo-European *h₁ep-der. Proto-Indo-European *h₁épsder. Proto-Indo-European *h₁épi Proto-Indo-European *h₂wer- Proto-Indo-European *-yeti Latin operiō Latin -culum Latin operculumbor. English operculum Borrowed from Latin operculum.

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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.

Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.