any of the silvery, spiny-rayed fishes of the family Polynemidae, having the lower part of the pectoral fin composed of numerous, separate, filamentous rays.
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British Dictionary definitions for threadfin
any spiny-finned tropical marine fish of the family Polynemidae, having pectoral fins consisting partly of long threadlike rays
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012