Webster's Revised Unabridged Dictionary · 1913

Manichaean

Manichaean , noun

[Late Latin Manichaeus: compare French manichéen.]

A believer in the doctrines of Manes, a Persian of the third century A. D., who taught a dualism in which Light is regarded as the source of Good, and Darkness as the source of Evil.
The Manichaeans stand as representatives of dualism pushed to its utmost development. — Tylor

Also: Manichee, Manichean

Manichaean , adjective

Of or pertaining to the Manichaeans.

Also: Manichean