Definition: tunny large sea-fish of the mackerel order, 1530, probably from M.Fr. thon (14c.), from O.Prov. ton, from L. thunnus “a tuna, tunny,” from Gk. thynnos “a tuna, tunny,” possibly in the literal sense of “darter,” from thynein: “dart along.” Aunt Ellen took the green can and pried it open with one of those old-fashioned … More Tuna: More Than Just a Canned Wonder