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operculum

oper·cu·lum

UK/əʊˈpɜː.kjʊ.ləm/ US/oʊˈpɝ.kjə.ləm/ uncommon

noun

1.

a hard flap serving as a cover for (a) the gill slits in fishes or (b) the opening of the shell in certain gastropods when the body is retracted

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Broader terms

WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved.