oarfish

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oar·fish

 (ôr′fĭsh′)
n. pl. oarfish or oar·fish·es
Any of several marine fishes of the family Regalecidae, especially Regalecus glesne, having a slender silvery body up to 11 meters (36 feet) in length, a crimson dorsal fin along its entire length, and long thin pelvic fins.

[Perhaps from the oarlike appearance of the pelvic fins.]

oarfish

(ˈɔːˌfɪʃ)
n, pl -fish or -fishes
(Animals) a very long ribbonfish, Regalecus glesne, with long slender ventral fins. Also called: king of the herrings
[C19: referring to the flattened oarlike body]

oar•fish

(ˈɔrˌfɪʃ, ˈoʊr-)

n., pl. (esp. collectively) -fish, (esp. for kinds or species) -fish•es.
any long, ribbon-shaped, deep-sea fish of the genus Regalecus, having a fin along the back that rises to a crest: up to 30 ft. (9 m) long.
[1855–60]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.oarfish - thin deep-water tropical fish 20 to 30 feet long having a red dorsal finoarfish - thin deep-water tropical fish 20 to 30 feet long having a red dorsal fin
malacopterygian, soft-finned fish - any fish of the superorder Malacopterygii
genus Regalecus, Reglaecus - type genus of the Regalecidae