A mustang is a small wild horse which lives on the plains of North America.
mustang in British English
(ˈmʌstæŋ)
noun
a small breed of horse, often wild or half wild, found in the western US
Word origin
C19: from Mexican Spanish mestengo, from mesta a group of stray animals
mustang in American English
(ˈmʌsˌtæŋ)
US
noun
a small wild or half-wild horse of the SW plains of the U.S.
Word origin
AmSp mestengo < Sp mesteño, belonging to an assoc. of cattlemen, ranging freely < mesta, (cattlemen's) group < ML mixta, a mixture < fem. of L mixtus, a mingling, orig. pp. of miscere, mix