OXFORD 9000
📚 noun • entry_id 31475

operculum

/əʊˈpɜː.kjʊ.ləm/
Meanings (ES + gloss)
opérculo
A covering flap in animals, such as a gill cover.
Hyoliths […] have a small, conical calcium carbonate shell, with a lid called an operculum.
Word forms