SAILFISH
sailfish
(noun) large pelagic game fish having an elongated upper jaw and long dorsal fin that resembles a sail
sailfish
(noun) a saltwater fish with lean flesh
Source: WordNet® 3.1
Etymology
Noun
sailfish (plural sailfishes or sailfish)
A fish of the genus Istiophorus, having a characteristic sail-like fin on its back.
Synonym: boohoo
The basking shark.
The quillback.
Source: Wiktionary
Sail"fish, n. (Zoöl.)
(a) The banner fish, or spikefish (Histiophorus.)
(b) The basking, or liver, shark.
(c) The quillback.
Source: Webster’s Unabridged Dictionary 1913 Edition