Operculum
//oʊˈpɝ.kjə.ləm//
"Operculum" in a Sentence (2 examples)
Hyoliths […] have a small, conical calcium carbonate shell, with a lid called an operculum.
I lifted the circular operculum from its place and laid it carefully on the bale.
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.