plural noun
Pec·tin·i·dae | \pekˈtinəˌdē\

Definition of Pectinidae 

: a family of bivalve mollusks having a single adductor muscle, comprising the pectens, and belonging to and formerly being coextensive with the suborder Pectinacea

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History and Etymology for Pectinidae

New Latin, from Pectin-, Pecten, type genus + -idae

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