plural noun
Ar·​ci·​dae | \ˈärsəˌdē\

Definition of Arcidae 

: a large family of chiefly tropical lamellibranch mollusks (order Filibranchia) with ribbed equivalve shell having a strong toothed hinge — see ark shell

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History and Etymology for Arcidae

New Latin, from Arca, type genus + -idae

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to express warning or disapproval

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