Having only one fourth pure blood, as horses, cattle, etc.
The Century Dictionary (Public Domain)
Use "quarter-bred" in a sentence
"The Indian slave girls who lived in their houses bore the children of their sons, and some of these half-bred and quarter-bred children were eventually accepted by the _gente de razon_, as the aristocrats called themselves."
""It would have done him a world of good, and perhaps saved many troubles, for, to tell the truth, I don't trust that quarter-bred Hebrew.""
"Dodson and a quarter-bred Creek Indian called John Big Dog climbed on the engine and showed the engineer three round orifices in pieces of ordnance that they carried."