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American Heritage Dictionary - Cite This Source Man·i·chae·ism (mn-kzm) Pronunciation Key also Man·i·chae·an·ism (-k-nzm)
n.
The syncretic, dualistic religious philosophy taught by the Persian prophet Manes, combining elements of Zoroastrian, Christian, and Gnostic thought and opposed by the imperial Roman government, Neo-Platonist philosophers, and orthodox Christians.
A dualistic philosophy dividing the world between good and evil principles or regarding matter as intrinsically evil and mind as intrinsically good.



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Note added at 8 minutos (2006-09-21 14:55:03 GMT)
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Both spellings are accepted

Dictionary.com Unabridged (v 1.0.1) - Cite This Source
Man‧i‧che‧an  /ˌmænɪˈkiən/ Pronunciation Key - Show Spelled Pronunciation[man-i-kee-uhn] Pronunciation Key - Show IPA Pronunciation

–noun 1. Also, Man‧i‧chee /ˈmænɪˌki/ Pronunciation Key - Show Spelled Pronunciation[man-i-kee] Pronunciation Key - Show IPA Pronunciation. an adherent of the dualistic religious system of Manes, a combination of Gnostic Christianity, Buddhism, Zoroastrianism, and various other elements, with a basic doctrine of a conflict between light and dark, matter being regarded as dark and evil.
–adjective 2. of or pertaining to the Manicheans or their doctrines.

Also, Man‧i‧chae‧an.