An adherent of Nestorius, patriarch of Constantinople to
   the fifth century, who has condemned as a heretic for maintaining that
   the divine and the human natures were not merged into one nature in
   Christ (who was God in man), and, hence, that it was improper to call
   Mary the mother of Christ; also, one of the sect established by the
   followers of Nestorius in Persia, india, and other Oriental countries,
   and still in existence. opposed to Eutychian.