Webster's English Dictionary

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mustang

mus.tang \'m*s-.tan\ n [MexSp mestengo, fr. Sp, stray, fr. mesten@o 
   strayed, fr.]mesta annual roundup of cattle that disposed of strays, fr. ML 
   (animalia) mixta mixed animals : the small hardy naturalized horse of the 
   western plains directly descend ed from horses brought in by the Spaniards; 
   also : BRONCO