1.  tunny(n = noun.food) tuna, tuna fish - important warm-water fatty fish of the genus Thunnus of the family Scombridae; usually served as steaks;
is a kind of saltwater fish
is a part of tuna, tunny
has particulars: albacore, bonito, bluefin, bluefin tuna

2.  tunny(n = noun.animal) tuna - any very large marine food and game fish of the genus Thunnus; related to mackerel; chiefly of warm waters;
is a kind of food fish, scombroid, scombroid fish
has parts: tuna, tuna fish, tunny
is a member of genus thunnus, thunnus
has particulars: albacore, long-fin tunny, thunnus alalunga, bluefin, bluefin tuna, horse mackerel, thunnus thynnus, thunnus albacares, yellowfin, yellowfin tuna

   The chiefly British equivalent of tuna; any one of several species of large oceanic fishes belonging to the Mackerel family, especially the common or great tunny (Thunnus thynnus syn. Albacora thynnus, formerly Orcynus thynnus) native of the Mediterranean Sea and the Atlantic Ocean. It sometimes weighs a thousand pounds or more, and is extensively caught in the Mediterranean. On the American coast it is called horse mackerel. See Illust. of Horse mackerel, under Horse. [1913 Webster]
" The little tunny (Gymnosarda alletterata) of the Mediterranean and North Atlantic, and the long-finned tunny, or albicore (Thunnus alalunga, see Albacore), are related species of smaller size." [1913 Webster]

tunny, n. (pl. same or -ies) = TUNA(1).

Etymology:
F thon f. Prov. ton, f. L thunnus f. Gk thunnos

long-fin tunny