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The Collaborative International Dictionary of English v.0.48 (gcide)

Irritant \Ir"ri*tant\, a. [LL. irritants, -antis, p. pr. of
irritare to make null, fr. L. irritus void; pref. ir- not
ratus established.] (Scots Law)
Rendering null and void; conditionally invalidating.
[1913 Webster]

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.
[1913 Webster]


Irritant \Ir"ri*tant\, a. [L. irritans, -antis, p. pr. of
irritare: cf. F. irritant. See {Irritate} to excite.]
Irritating; producing irritation or inflammation.
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Irritant \Ir"ri*tant\, n. [Cf. F. irritant.]
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1. That which irritates or excites.
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2. (Physiol. & Med.) Any agent by which irritation is
produced; as, a chemical irritant; a mechanical or
electrical irritant.
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3. (Toxicology) A poison that produces inflammation.
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{Counter irritant}. See under {Counter}.

{Pure irritant} (Toxicology), a poison that produces
inflammation without any corrosive action upon the
tissues.
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