Etymology
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vaquero (n.)
1826, from Spanish, literally "cowboy," from vaca "cow," from Latin vacca "cow," a word of uncertain origin.
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buckaroo (n.)
"cowboy," 1907, American English, earlier buckayro (1889), bakhara (1827), from Spanish vaquero "cowboy," from vaca "cow," from Latin vacca, a word of uncertain origin. Spelling altered by influence of buck (n.1).
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