tuna

1 [too-nuh, tyoo-]
noun, plural (especially collectively) tuna (especially referring to two or more kinds or species) tunas.
1.
any of several large food and game fishes of the family Scombridae, inhabiting temperate and tropical seas. Compare albacore, bluefin tuna, yellowfin tuna.
2.
any of various related fishes.
3.
Also called tuna fish. the flesh of the tuna, used as food.

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

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tuna

2 [too-nuh, tyoo-]
noun
1.
any of various prickly pears, especially either of two erect, treelike species, Opuntia tuna or O. ficus-indica, of Mexico, bearing a sweet, edible fruit.
2.
the fruit of these plants.

Origin:
1545–55; < Spanish < Taino

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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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)
 
n
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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Etymonline
Word Origin & History

tuna
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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Example sentences
His subsequent work on causes including dolphin-safe tuna evolved into
  community work.
The fishing potential, mostly lobster and tuna, is not fully exploited.
Tuna fishing and tuna processing plants are the backbone of the private sector,
  with canned tuna the primary export.
Tuna tartare is one of those dishes that acts as a canvas for a chef's culinary
  sensibilities.
Images for tuna
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