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The Collaborative International Dictionary
Heresiarchy

Heresiarchy \Her"e*si*arch`y\, n. A chief or great heresy. [R.]

The book itself [the Alcoran] consists of heresiarchies against our blessed Savior.
--Sir T. Herbert.

Wiktionary
heresiarchy

n. A chief or great heresy.

Usage examples of "heresiarchy".

Ahead the lights were coming on in Kyohvic, the main port of the straggling seaboard republic known as the Heresiarchy of Tain.