Dictionary:

bluefin tuna

  (blūfĭn')

A very large tuna (Thunnus thynnus) of temperate waters. It is an important commercial and eating variety.

The noun has 2 meanings:

Meaning #1: flesh of very large tuna
  Synonym: bluefin

Meaning #2: largest tuna; to 1500 pounds; of mostly temperate seas: feed in polar regions but breed in tropics
  Synonyms: bluefin, horse mackerel, Thunnus thynnus

Bluefin tuna may mean any of several species of tuna:

• Northern bluefin tuna Thunnus thynnus
• Southern bluefin tuna Thunnus maccoyii
• Pacific bluefin tuna Thunnus orientalis

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