heresiarch

[ huh-ree-zee-ahrk, -see-, her-uh-see- ]
/ həˈri ziˌɑrk, -si-, ˈhɛr ə si- /

noun

a leader in heresy; the leader of a heretical sect.

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Origin of heresiarch

1615–25; <Late Latin haeresiarcha<Greek hairesiarchḗs the leader of a school, equivalent to haíresi(s) heresy + -archēs-arch
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

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British Dictionary definitions for heresiarch

heresiarch
/ (hɪˈriːzɪˌɑːk) /

noun

the leader or originator of a heretical movement or sect
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012