Source : Webster's Revised Unabridged Dictionary (1913)

Nestorian \Nes*to"ri*an\, n. (Eccl. Hist.)
   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}.

Nestorian \Nes*to"ri*an\, a.
   1. Of or relating to the Nestorians.

   2. relating to, or resembling, Nestor, the aged warior and
      counselor mentioned by Homer; hence, wise; experienced;
      aged; as, Nestorian caution.

Source : WordNet®

Nestorian
     adj : relating to Nestorius or Nestorianism