Source : Webster's Revised Unabridged Dictionary (1913)

Tunny \Tun"ny\ (t[u^]n"n[y^]), n.; pl. {Tunnies}. [L. thunnus,
   thynnus, Gr. qy`nnos, qy^nos: cf. It. tonno, F. & Pr. thon.]
   (Zo["o]l.)
   Any one of several species of large oceanic fishes belonging
   to the Mackerel family, especially the common or great tunny
   ({Orcynus or Albacora 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}.
   [Written also {thynny}.]

   Note: The little tunny ({Gymnosarda alletterata}) of the
         Mediterranean and North Atlantic, and the long-finned
         tunny, or albicore (see {Albicore}), are related
         species of smaller size.