oarfishEnglishOxford Dictionary of Englishoarfish /ˈɔːfɪʃ / ▸ noun (plural oarfish or plural oarfishes) a very long, narrow silvery marine fish of deep water, with a deep red dorsal fin running the length of the body. Also called ribbonfish,, king of the herrings Regalecus glesne, family Regalecidae.