Source : Webster's Revised Unabridged Dictionary (1913)

Manichaean \Man`i*ch[ae]"an\, Manichean \Man`i*che"an\, Manichee
\Man"i*chee\, n. [LL. Manichaeus: cf. F. manich['e]en.]
   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 Manich[ae]ans stand as representatives of dualism
         pushed to its utmost development.        --Tylor.

Manichaean \Man`i*ch[ae]"an\, Manichean \Man`i*che"an\, a.
   Of or pertaining to the Manich[ae]ans.

Source : WordNet®

Manichaean
     n : an adherent of Manichaeism [syn: {Manichean}, {Manichee}]

Manichaean
     adj 1: of or relating to the philosophical doctrine of dualism; "a
            Manichaean conflict between good and evil" [syn: {dualistic}]
     2: of or relating to Manichaeism [syn: {Manichean}, {Manichee}]