irritant

[ir-i-tnt]
adjective
1.
tending to cause irritation; irritating.
noun
2.
anything that irritates.
3.
Physiology, Pathology. a biological, chemical, or physical agent that stimulates a characteristic function or elicits a response, especially an inflammatory response.

Origin:
1630–40; < Latin irrītant- (stem of irrītāns), present participle of irrītāre to irritate; see -ant

irritancy, noun
nonirritancy, noun
nonirritant, adjective
unirritant, adjective
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World English Dictionary
irritant (ˈɪrɪtənt)
 
adj
1.  causing irritation; irritating
 
n
2.  something irritant
 
'irritancy
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

irritant ir·ri·tant (ĭr'ĭ-tənt)
adj.
Causing irritation, especially physical irritation. n.
A source of irritation.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
It contains crystals of calcium oxalate, an irritant deactivated by heat.
Seems to me to be the result of an irritant on the skin.
For me the enigma remains, leaving me as an irritant to those who have attained certainty.
Regarded as a counter-irritant to slang, archaism is a failure.
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