This refers to any substance that causes inflammation following immediate, prolonged, or repeated contact with skin or mucous membranes.

From the BioTech Dictionary at For further information see the BioTech homenode.

Ir"ri*tant (?), a. [LL. irritants, -antis, p. pr. of irritare to make null, fr. L. irritus void; pref. ir- not + ratus established.] ScotsLaw

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.


© Webster 1913.

Ir"ri*tant, a. [L. irritans, -antis, p. pr. of irritare: cf. F. irritant. See Irritate to excite.]

Irritating; producing irritation or inflammation.


© Webster 1913.

Ir"ri*tant, n. [Cf. F. irritant.]


That which irritates or excites.

2. Physiol. & Med.

Any agent by which irritation is produced; as, a chemical irritant; a mechanical or electrical irritant.

3. Toxicology

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.


© Webster 1913.

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