threadfin

noun thread·fin \ ˈthred-ˌfin \
Updated on: 15 Apr 2018

Definition of threadfin

: any of various bony fishes (family Polynemidae, especially genus Polydactylus) having elongated filamentous rays on the pectoral fin; also : a fish (such as Dorosoma pretense of the herring family) having usually one similar ray extending from a fin

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First Known Use of threadfin

circa 1890

in the meaning defined above

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