Heresiarch, n.
Etymology: [L. haeresiarcha, Gr. hérésiarque.]
A leader in heresy; the chief of a sect of heretics. Bp. Stillingfleet.
Shades of meaning
Fernald has no entry of its own for heresiarch; he lists it under heretic.
Where he writes about it:
A heresiarch is the author of a heresy or the leader of a heretical party, and is thus at once a heretic and a schismatic. — from heretic
Antonyms
none given