TUNNY

noun any one of several species of large oceanic fishes belonging to the mackerel family, especially the common or great tunny (orcynus / 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.