from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Causing irritation, especially physical irritation.
  • n. A source of irritation: tobacco smoke, a common eye irritant.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Causing irritation or inflammation.
  • n. Any medication designed to cause irritation
  • n. A source of irritation.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Rendering null and void; conditionally invalidating.
  • adj. Irritating; producing irritation or inflammation.
  • n. That which irritates or excites.
  • n. Any agent by which irritation is produced
  • n. A poison that produces inflammation.

from The Century Dictionary and Cyclopedia

  • Irritating; exasperating; specifically, producing pain, heat, or tension; causing inflammation: as, an irritant poison.
  • n. That which irritates or exasperates; specifically, a therapeutic agent that causes pain, heat, or tension, or a poison that produces inflammation.
  • Rendering null and void.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. something that causes irritation and annoyance


French, from Latin irrītāns, irrītant-, present participle of irrītāre, to irritate.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From French (Wiktionary)



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