- the leader or originator of a heretical movement or sect
WordReference Random House Unabridged Dictionary of American English © 2026
he•re•si•arch
(hə rē′zē ärk′, -sē-, her′ə sē-),USA pronunciation n.
- a leader in heresy;
the leader of a heretical sect.
- Greek hairesiarché̄s the leader of a school, equivalent. to haíresi(s) heresy + -archēs -arch
- Late Latin haeresiarcha
- 1615–25
Collins Concise English Dictionary © HarperCollins Publishers::
heresiarch /hɪˈriːzɪˌɑːk/ n
'heresiarch' also found in these entries (note: many are not synonyms or translations):