HAIRTAIL
cutlassfish, frost fish, hairtail
(noun) long-bodied marine fishes having a long whiplike scaleless body and sharp teeth; closely related to snake mackerel
Source: WordNet® 3.1
Etymology
Noun
hairtail (plural hairtails)
Any of a number of species of marine fishes of the family Trichiuridae, long, band-like, with a slender, pointed tail.
Synonyms
• (fish in family Trichiuridae): bladefish.
Source: Wiktionary
Hair"tail`, n. (Zoöl.)
Definition: Any species of marine fishes of the genus Trichiurus; esp., T.
lepterus of Europe and America. They are long and like a band, with a
slender, pointed tail. Called also bladefish.
Source: Webster’s Unabridged Dictionary 1913 Edition