Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. One who encourages and propagates error.
  • n. One who holds onto an erroneous belief.

from the GNU version of the Collaborative International Dictionary of English

  • n. One who encourages and propagates error; one who holds to error.

from The Century Dictionary and Cyclopedia

  • n. One who errs, or who encourages and propagates error.

Etymologies

error +‎ -ist (Wiktionary)

Examples

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  • Not a neologism, as tagged:
    "The drunkard promises a speedy reformation; but the errorist in principle, although led to the commission of the blackest crimes, presses forward in the full persuasion that he is doing his duty" --The Christian Magazine, Vol. 2, p.47. 1825.

    October 17, 2011

  • A member of a fanatical cult who blows himself up in a mannequin factory.

    March 4, 2009