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heresiarch

Pronunciation: /hɛˈriːzɪɑːk/

Definition of heresiarch

noun

the founder of a heresy or the leader of a heretical sect.

Origin:

mid 16th century: via ecclesiastical Latin from ecclesiastical Greek hairesiarkhēs 'leader of a sect', from hairesis 'heretical sect, heresy' + arkhēs 'ruler'