[f. ERROR + -IST.] One who is inclined to error; one who encourages and propagates error.

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1647.  Ward, Simp. Cobler (ed. 3), 17. Prudent men … should doe well not to ingage themselves in conference with Errorists.

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1849.  Blackw. Mag., LXV. 537. Our feelings are with such errorists.

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1874.  J. H. Blunt, Dict. Sects, 4. Adalbert an errorist of the eighth century … was opposed to St. Boniface Winfred.

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