1 [too-nuh, tyoo-]
noun, plural (especially collectively) tuna (especially referring to two or more kinds or species) tunas.
any of several large food and game fishes of the family Scombridae, inhabiting temperate and tropical seas. Compare albacore, bluefin tuna, yellowfin tuna.
any of various related fishes.
Also called tuna fish. the flesh of the tuna, used as food.

1880–85, Americanism; < American Spanish, variant of Spanish atún < Arabic al the + tūn < Greek thýnnos tunny

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World English Dictionary
tuna1 (ˈtjuːnə)
n , pl -na, -nas
1.  Also called: tunny any of various large marine spiny-finned fishes of the genus Thunnus, esp T. thynnus, chiefly of warm waters: family Scombridae. They have a spindle-shaped body and widely forked tail, and are important food fishes
2.  any of various similar and related fishes
[C20: from American Spanish, from Spanish atún, from Arabic tūn, from Latin thunnus tunny, from Greek]

tuna2 (ˈtjuːnə)
1.  any of various tropical American prickly pear cacti, esp Opuntia tuna, that are cultivated for their sweet edible fruits
2.  the fruit of any of these cacti
[C16: via Spanish from Taino]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1881, from Amer.Sp. (California) tuna, from Sp. atun, from Ar. tun, from L. thunnus "tunny" (see tunny).
Online Etymology Dictionary, © 2010 Douglas Harper
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