Etymology

taco (n.)

tortilla filled with spiced meat, etc., 1949, from Mexican Spanish, "light lunch," literally "plug, wadding."

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Definitions of taco

taco (n.)
(ethnic slur) offensive term for a person of Mexican descent;
Synonyms: greaser / wetback
taco (n.)
a tortilla rolled cupped around a filling;
From wordnet.princeton.edu