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irritant

ir·ri·tant

irritant

pronunciation:
I rih tnt
parts of speech:
adjective, noun
part of speech: adjective
definition: causing or tending to cause irritation, esp. physical irritation; irritating.
antonyms:
analgesic
 
part of speech: noun
definition: that which irritates, esp. a physical stimulus that sets off a characteristic function or response.
Smoke is an irritant that makes the eyes water.
antonyms:
analgesic, anodyne
derivation: irritancy (n.)