/ ˈtjuːnə; NAmE ˈtuːnə/ noun
[ C , U ] ( pl. tuna or tunas ) (also ˈtuna fish ) ( BrE also less frequent tunny ) a large sea fish that is used for food :
fishing for tuna
tuna steaks
a tin / can of tuna in vegetable oil
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WORD ORIGIN
late 19th cent.: from American Spanish , from Spanish atún tunny.