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Definition of: irritant
(ir′ə·tənt) adjective
1. Causing irritation.
2. Med. Irritating the eyes, nose, or digestive system: an irritant gas or smoke.
—noun
1. Pathol. An agent of inflammation, pain, etc.
2. A provocation; spur. [<L irritans, -antis, ppr. of irritare]
—ir′ri·tan·cy noun
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