1) Cutlassfish 2) Fish 3) Frost fish 4) Percoid 5) Percoid fish 6) Percoidean 1) Cutlassfish 
• (n.) 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.
Hair'tail` (-tāl`) noun (Zoology) Any species of marine fishes of the genus Trichiurus ; esp., T. lepturus of Europe and America. They are long and like a band, with a slender, pointed tail. Called also bladefish .