noun, plural (especially collectively) sailfish (especially referring to two or more kinds or species) sailfishes.
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.

1585–95; sail + fish Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sailfish (ˈseɪlˌfɪʃ)
n , pl -fish, -fishes
1.  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
2.  another name for basking shark

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Example sentences
Sailfish spawn in tropical and subtropical waters in the spring through summer.
Sailfish spawn in tropical and subtropical waters in the spring and throughout
  the summer.
Five white marlin, two blue marlin and a sailfish were caught and released.
Sailfish tend to be found in shallower waters, closer to shore, which allows
  the use of smaller boats with outboard engines.
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