'Heresiarch' definitions:

Definition of 'Heresiarch'

From: GCIDE

Heresiarch \Her"e*si*arch\ (?; 277), n. [L. haeresiarcha, Gr. ?; ? heresy + ? leader, ? to lead: cf. F. h['e]r['e]siarque.] A leader in heresy; the chief of a sect of heretics. --Bp. Stillingfleet. [1913 Webster]