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
Recent Examples of threadfin from the Web
Both smallmouth and largemouth bass are feasting on the threadfin shad population and anglers are fishing surface plugs early in the morning to score on bass.
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First Known Use of threadfin
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