Source : Webster's Revised Unabridged Dictionary (1913)

Half-breed \Half"-breed`\, a.
   Half-blooded.

Half-breed \Half"-breed`\, n.
   A person who is blooded; the offspring of parents of
   different races, especially of the American Indian and the
   white race.

Source : WordNet®

half-breed
     adj : (of animals) having only one purebred parent [syn: {half-blooded},
            {half-bred}]
     n : half-caste offspring of parents of different races
         (especially of white and Indian parents) [syn: {breed}]