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Operculum
Cervical mucus plug
Dehiscence (botany)
Operculum (animal)
Operculum (bird)
Operculum (botany)
Operculum (brain)
Operculum (bryozoa)
Operculum (dentistry)
Operculum (fish)
Operculum (gastropod)
Operculum papillare
Vidalia (fruit fly)
puparium