ISSUER n.
A noun suffix denoting an agent, or doer, one who practices, a believer in; as, theorist, one who theorizes; socialist, one who holds to socialism; sensualist, one given to sensuality.
MANICHAEAN; MANICHEAN; MANICHEE n.
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 Manichæans stand as representatives of dualism pushed to its utmost development. Tylor.