any spiny-rayed fishes of the family Polynemidae, having the lower part of the pectoral fin composed of numerous, separate, filamentous rays.

1885–90; thread + fin Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
threadfin (ˈθrɛdˌfɪn)
n , pl -fin, -fins
any spiny-finned tropical marine fish of the family Polynemidae, having pectoral fins consisting partly of long threadlike rays

Collins English Dictionary - Complete & Unabridged 10th Edition
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Encyclopedia Britannica


any of about 24 species of marine fishes of the family Polynemidae (order Perciformes), widely distributed along warm seashores, often over sand. Threadfins have two well-separated dorsal fins and a forked tail, and are usually silvery in colour. Their name refers to their pectoral fins, each of which is divided into an upper, normally shaped fin and a lower section consisting of four to seven long, threadlike rays that serve as sensory devices; they are especially long in the young. Most threadfins are 30-60 centimetres (1-2 feet) long; one species, Eleutheronema tetradactylum of India, is about 1.8 metres (6 feet) long.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Cast in shallow waters where the threadfin shad tend to linger, especially
  right before the temperature starts to drop.
Predatory fish have diverse and abundant forage in the form of alewives,
  gizzard shad, threadfin shad and shiners.
Use of threadfin shad as a forage species in channel catfish production ponds.
Live bait includes large minnows or gizzard or threadfin shad.
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