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.
Any of a family (Regalecidae, order Lampriformes) of large, long, narrow, deep-sea bony fishes having a fin along the length of the back and a manelike crest behind the head: some reach a length of 9m (c. 29.5 ft) and are responsible for many reports of sea serpents.
Origin of oarfish
- Perhaps from the oarlike appearance of the pelvic fins
From American Heritage Dictionary of the English Language, 5th Edition