Rendering null and void; conditionally invalidating. The 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. Hayward.
Irritating; producing irritation or inflammation.
That which irritates or excites.
Any agent by which irritation is produced; as, a chemical irritant; a mechanical or electrical irritant.
A poison that produces inflammation. Counter irritant. See under Counter. -- Pure irritant (Toxicology), a poison that produces inflammation without any corrosive action upon the tissues.
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