1. relatively small tuna with choice white flesh; major source of canned tuna • Hypernyms: tuna, tuna fish, tunny • Part Holonyms: long-fin tunny, Thunnus alalunga 2. large pelagic tuna the source of most canned tuna; reaches 93 pounds and has long pectoral fins; found worldwide in tropical and temperate waters • Syn: long-fin tunny, Thunnus alalunga • Hypernyms: tuna, tunny