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4 definitions found
 for Irritant
From The Collaborative International Dictionary of English v.0.48 :

  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]

From The Collaborative International Dictionary of English v.0.48 :

  Irritant \Ir"ri*tant\, a. [L. irritans, -antis, p. pr. of
     irritare: cf. F. irritant. See Irritate to excite.]
     Irritating; producing irritation or inflammation.
     [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 :

  Irritant \Ir"ri*tant\, n. [Cf. F. irritant.]
     [1913 Webster]
     1. That which irritates or excites.
        [1913 Webster]
  
     2. (Physiol. & Med.) Any agent by which irritation is
        produced; as, a chemical irritant; a mechanical or
        electrical irritant.
        [1913 Webster]
  
     3. (Toxicology) A poison that produces inflammation.
        [1913 Webster]
  
     Counter irritant. See under Counter.
  
     Pure irritant (Toxicology), a poison that produces
        inflammation without any corrosive action upon the
        tissues.
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

  irritant
      n 1: something that causes irritation and annoyance; "he's a
           thorn in my flesh" [syn: irritant, thorn]

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