Irritant

Origin

From French

Full definition of irritant

Adjective

1. Causing irritation or inflammation.
2. (legal, Scotland) Rendering null and void; conditionally invalidating.
• HaywardThe states elected Harry, Duke of Anjou, for their king, with this clause irritant; that, if he did violate any part of his oath, the people should owe him no allegiance.

Noun

1. Any medication designed to cause irritation
2. A source of irritation.----