preoperculum
/ˌpriːə(ʊ)ˈpəːkjʊləm/ /ˌpriːɒˈpəːkjʊləm/(also praeoperculum)
noun
Ichthyol. The anterior of four bones forming the operculum in fishes.
Origin
Early 19th century; earliest use found in John Stark (fl. 1828). From pre- + operculum.
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