mulatto
Concise Oxford English Dictionary © 2008 Oxford University Press:
mulatto /m(j)uːˈlatəʊ/
▶noun (pl. mulattoes or mulattos) offensive a person with one white and one black parent. ▶adjective relating to or denoting a mulatto or mulattoes.
– origin C16: from Sp. mulato ‘young mule or mulatto’, formed irregularly from mulo ‘mule’.
'mulatto' also found in these Oxford entries:

