1. (Science: marine biology) a large tropical fish (Orcynus pelamys) allied to the tunny. It is about three feet long, blue above, with four brown stripes on the sides. It is sometimes found on the American coast.
2. The skipjack (Sarda Mediterranea) of the atlantic, an important and abundant food fish on the coast of the united states, and (s. Chilensis) of the Pacific, and other related species. They are large and active fishes, of a blue colour with black oblique stripes.