Etymology
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sailfish (n.)

also sail-fish, "fish with a long or large dorsal fin," 1590s, from sail (n.) + fish (n.).

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Definitions of sailfish

sailfish (n.)
a saltwater fish with lean flesh;
sailfish (n.)
large pelagic game fish having an elongated upper jaw and long dorsal fin that resembles a sail;
From wordnet.princeton.edu