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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.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


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]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(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.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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
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