Noun thunnus thynnus has 1 sense
  1. bluefin, bluefin tuna, horse mackerel, Thunnus thynnus - largest tuna; to 1500 pounds; of mostly temperate seas: feed in polar regions but breed in tropics
    --1 is a kind of tuna, tunny
    --1 is a member of Thunnus, genus Thunnus
    --1 has parts: bluefin, bluefin tuna
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