Meaning of “irritant” in the English Dictionary

"irritant" in American English

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irritantnoun [ C ]

us /ˈɪr·ɪ·tənt/

a cause of an uncomfortable physical reaction:

Especially in the spring, plant pollen is an irritant that makes the eyes and throat itchy and can cause breathing problems.

(Definition of “irritant” from the Cambridge Academic Content Dictionary © Cambridge University Press)