n.1 an adherent of a religious system of the 3rd-5th c., representing Satan in a state of everlasting conflict with God.
2 Philos. a dualist (see DUALISM).
Derivatives:
Manichean adj. & n. (also Manichaean). Manicheism n. (also Manichaeism).
Etymology: LL Manichaeus f. late Gk Manikhaios, f. Manes or Manichaeus Persian founder of the sect