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From The Collaborative International Dictionary of English v.0.48:
Eutychian \Eu*tych"i*an\, n. (Eccl. Hist.) A follower of Eutyches [5th century], who held that the divine and the human in the person of Christ were blended together as to constitute but one nature; a monophysite; -- opposed to Nestorian. [1913 Webster]