bonito

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of various marine food and game fishes of the family Scombridae and especially the genus Sarda, resembling a small tuna.

from The Century Dictionary.

• Pretty; nice; fine; graceful: an epithet in use in Spanish-speaking countries or regions originally settled by Spaniards.
• noun A name applied primarily to pelagic fishes of the family Scombridæ, of a robust fusiform shape, and secondarily to others supposed to resemble them or be related to them.
• noun In Australia, the oceanic bonito, Gymnosarda pelamis.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Zoöl.) 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.
• noun any of a variety of scombroid fishes of the genera Sarda or Euthynnus, with a size intermediate between those of the smaller mackerels and the tunas. It is applied especially to the skipjack tuna (Euthynnus pelamis, syn. Katsuwonus pelamis, formerly Sarda Mediterranea, also called skipjack) of the Atlantic, an important and abundant food fish on the coast of the United States, and (Sarda Chilensis) of the Pacific, and other related species. These are large and active fishes, of a blue color above and silver below, with black oblique stripes.
• noun The medregal (Seriola fasciata), an edible fish of the southern of the United States and the West Indies.
• noun The cobia or crab eater (Elacate canada), an edible fish of the Middle and Southern United States.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Any of various marine fish of the genus Sarda, that are related to and resemble the tuna.
• noun A large tropical fish, the skipjack, allied to the tunny, Katsuwonus pelamis or Orcynus pelamys.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun fish whose flesh is dried and flaked for Japanese cookery; may be same species as skipjack tuna
• noun flesh of mostly Pacific food fishes of the genus Sarda of the family Scombridae; related to but smaller than tuna
• noun any of various scombroid fishes intermediate in size and characteristics between mackerels and tunas