taco

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US /ˈtɑː.koʊ/ 
UK /ˈtæk.əʊ/ 

Longman Dictionary of Contemporary English

taco

taco /ˈtækəʊ, ˈtɑː- $ ˈtɑːkoʊ/ BrE AmE noun (plural tacos) [countable]
[Date: 1900-2000; Language: Mexican Spanish; Origin: Spanish, 'wad, snack']
a type of Mexican food made from a corn ↑tortilla that is folded in half and filled with meat, beans etc

Oxford Advanced Learner's Dictionary

taco

taco [taco tacos]   [ˈtækəʊ]    [ˈtɑːkoʊ]  noun (pl. tacos)(from Spanish)
a type of Mexican food consisting of a crisp fried pancake that is folded over and filled with meat, beans, etc. 
Word Origin:

Mexican Spanish, from Spanish, literally plug, wad.

Cambridge Advanced Learner's Dictionary

Cambridge Advanced Learner's Dictionary - 4th Edition
 

taco / ˈtæk.əʊ /   / ˈtɑː.koʊ / noun [ C ] ( plural tacos )

a hard, folded tortilla (= thin flat bread) filled with meat, cheese, etc. and hot, spicy sauce

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Merriam-Webster's Advanced Learner's Dictionary

taco

ta·co /ˈtɑːkoʊ/ noun, pl -cos [count] : a Mexican food that consists of a folded and usually fried piece of thin bread (called a tortilla) that is filled with meat, cheese, lettuce, etc.