tu·na /ˈtunə/
 鮪;金槍魚;霸王樹的一種
 Tu·na, n.
 1. Zool. Any one of several species of large oceanic fishes belonging to the mackerel family Scombridae, especially the bluefin tuna (Thunnus thynnus, formerly Orcynus thynnus or  Albacora thynnus), called also the common tunny or great tunny, a native of the Mediterranean Sea and of temperate parts of the Atlantic Ocean.  It sometimes weighs a thousand pounds or more, and is caught commercially in large quantity for use as food; -- also called, especially in Britain, tunny.  It is also one of the favorite fishes used by the Japanese in preparing sushi.  On the American coast, especially in New England, it is sometimes called the horse mackerel.  Another well-known species is the yellowfin tuna (Thunnus albacares) of warm seas. the See Illust. of Horse mackerel, under Horse.
 Note: The little tunny (Gymnosarda alletterata) of the Mediterranean and North Atlantic, and the long-finned tunny, or albacore (Thunnus alalunga) (see Albacore), are related species of smaller size.
 2. The bonito, 2.
 ◄ ►
 Tu·na n. Bot. The Opuntia Tuna. See Prickly pear, under Prickly.
 tuna
      n 1: tropical American flat-jointed prickly pear; Jamaica [syn: Opuntia
           tuna]
      2: important warm-water fatty fish of the genus Thunnus of the
         family Scombridae; usually served as steaks [syn: tuna
         fish, tunny]
      3: any very large marine food and game fish of the genus
         Thunnus; related to mackerel; chiefly of warm waters [syn:
          tunny]
      4: New Zealand eel [syn: Anguilla sucklandii]