Definitions of bluefin
  1. noun
    largest tuna; to 1500 pounds; of mostly temperate seas: feed in polar regions but breed in tropics
    synonyms: Thunnus thynnus, bluefin tuna, horse mackerel
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    type of:
    tuna, tunny
    any very large marine food and game fish of the genus Thunnus; related to mackerel; chiefly of warm waters
  2. noun
    flesh of very large tuna
    synonyms: bluefin tuna
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    type of:
    tuna, tuna fish, tunny
    important warm-water fatty fish of the genus Thunnus of the family Scombridae; usually served as steaks
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