1911 Encyclopædia Britannica/Mestizo

MESTIZO (adopted from the Spanish, the Portuguese form being mestiço, from Lat. miscere, to mix), a term originally meaning a half-breed, one of whose parents was Spanish, and now used occasionally of any half-breed, but especially to denote persons of mixed Spanish (or Portuguese) and American Indian blood. The offspring of such half-breeds are also called mestizoes. The feminine form is mestiza.