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Definition of tuna
noun (plural same or tunas)
- a large and active predatory schooling fish of warm seas, extensively fished commercially and popular as a game fish. See also tunny.
- Thunnus and other genera, family Scombridae: several species, including the albacore, bigeye, bluefin, skipjack, and yellowfin
late 19th century: from American Spanish, from Spanish atún 'tunny'