sailfish

[ seyl-fish ]
/ ˈseɪlˌfɪʃ /
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noun, plural (especially collectively) sail·fish, (especially referring to two or more kinds or species) sail·fish·es.

a large tropical and subtropical marine fish, Istiophorus platypterus, of the family Istiophoridae, distinguished by a long, high dorsal fin, long pelvic fins, and a double keel on each side of the tail.
any of several related fishes having a high dorsal fin.

Origin of sailfish

First recorded in 1585–95; sail + fish
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for sailfish

sailfish

/ (ˈseɪlˌfɪʃ) /

noun plural -fish or -fishes

any of several large scombroid game fishes of the genus Istiophorus, such as I. albicans (Atlantic sailfish), of warm and tropical seas: family Istiophoridae. They have an elongated upper jaw and a long sail-like dorsal fin
another name for basking shark
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