plural noun
Poly·​nem·​i·​dae | \ -neməˌdē\

Definition of Polynemidae

: a family (usually coextensive with a suborder Polynemoidea of Percomorphi) of fishes that resemble mullets but have the pectoral fin divided into two parts of which the upper is much like an ordinary fin and the lower is composed of several separate slender threadlike rays and abound on the sandy shores of warm seas, many of them being valued for food and some yielding isinglass

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History and Etymology for Polynemidae

New Latin, from Polynemus, type genus + -idae

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