Irritant

Irritant

(1): ( n.) That which irritates or excites.

(2): ( a.) Irritating; producing irritation or inflammation.

(3): ( n.) A poison that produces inflammation.

(4): ( a.) Rendering null and void; conditionally invalidating.

(5): ( n.) Any agent by which irritation is produced; as, a chemical irritant; a mechanical or electrical irritant.