noun.
A person having white ancestors except for one black grandparent. Used especially as a classification under certain European colonial legal systems and now considered offensive.
The Century Dictionary and Cyclopedia
noun.
The offspring of a mulatto and a white person; a person having one fourth African blood.
Fourth in descent from a negro parent, one parent in each generation having been white.
the GNU version of the Collaborative International Dictionary of English
noun.
The offspring of a mulatto and a white person; a person quarter-blooded.