Source : Webster's Revised Unabridged Dictionary (1913)

Mestizo \Mes*ti"zo\, n.; pl. {Mestizos}. [Sp. mestizo; akin to
   OF. mestis, F. m['e]tis; all fr. (assumed) LL. mixtitius, fr.
   L. mixtus mixed, p. p. of miscere to mix. See {Mix}, and cf.
   {Mestee}, {M['E]tif}, {M['E]tis}, {Mustee}.]
   The offspring of an Indian or a negro and a European or
   person of European stock. [Spanish America]

   {Mestizo wool}, wool imported from South America, and
      produced by mixed breeds of sheep.

Source : WordNet®

mestizo
     n : a person of mixed racial ancestry (especially mixed European
         and Native American ancestry) [syn: {ladino}]
     [also: {mestizoes} (pl)]