North American term for a person who has some mixture between white and black ancestry. It is usually unknown in these people and not so obvious, until a DNA test is taken.

mulatto
/m(j)u ˈlatəʊ/

DATED•OFFENSIVE
noun
noun: mulatto; plural noun: mulattoes; plural noun: mulattos
a person of mixed white and black ancestry, especially a person with one white and one black parent.

a historical racial classification of people who are born of one white parent and one black parent, as well as mixed-race people in general. The term mulatto is now chiefly considered to be derogatory or offensive.

a mixed race person , usually depicted as being of black ( african american ) & white ( european ) admixture , but not exclusive to that admixture .