irritant

Causing irritation, especially physical irritation.

A source of irritation.

Rendering null and void.

Irritating; exasperating; specifically, producing pain, heat, or tension; causing inflammation: as, an irritant poison.

That which irritates or exasperates; specifically, a therapeutic agent that causes pain, heat, or tension, or a poison that produces inflammation.

Irritating; producing irritation or inflammation.

Rendering null and void; conditionally invalidating.

That which irritates or excites.

Any agent by which irritation is produced

A poison that produces inflammation.