: any of numerous large vigorous scombroid food and sport fishes (as an albacore or a bluefin tuna)
: the flesh of a tuna especially when canned for use as food —called also tuna fish
Origin of TUNA
American Spanish, alteration of Spanish atún, modification of Arabic tūn, from Latin thunnus, from Greek thynnos
First Known Use: 1881
Any of seven species (genus Thunnus, family Scombridae) of commercially valuable food fishes. Species range from the 80-lb (36-kg) albacore to the bluefin tuna (T. thynnus), which grows to 14 ft (4.3 m) long and weighs up to 1,800 lbs (800 kg). Tunas have a slender, streamlined body and a forked or crescent-shaped tail. They are unique among fishes in having a vascular system modified to maintain a body temperature above the water temperature. Though slow swimmers, they migrate long distances over all the world's oceans. They eat fishes, squid, shellfish, and plankton.