a person of racially mixed ancestry, especially, in Latin America, of mixed American Indian and European, usually Spanish or Portuguese, ancestry, or, in the Philippines, of mixed native and foreign ancestry.
1580-90; < Spanish, noun use of adj. mestizo < Vulgar Latin*mixtīcius mixed
c.1588, from Sp. mestizo "of mixed European and Amerindian parentage," from L.L. mixticius "mixed, mongrel," from L. mixtus "mixed," pp. of miscere "to mix, mingle" (see mix). Fem. form mestiza is attested from c.1582.