From Hindupedia, the Hindu Encyclopedia

By Jit Majumdar

  1. born of impropriety; ill-begotten
  2. in brahminical mores, six types of offsprings born out of forbidden marital unions that are taboo, namely the marriage between a brāmhaņa with any of the “lower” 3 varņas, that of a kşhatriya with a vaiśya or a śudra, and that of a vaiśya and a śudra (M. Sańhitā).