The Collaborative International Dictionary of English v.0.48:
Half-caste \Half"-caste`\ (-k[.a]st), n. One born of a European parent on the one side, and of a Hindu or Mohammedan on the other. Also adjective; as, half-caste parents. [1913 Webster]WordNet (r) 3.0 (2006):
half-caste n 1: an offensive term for the offspring of parents of different races or cultures