Longman Dictionary of Contemporary English homepage

irritant

 noun
     
Related topics: Illness and Disability
ir‧ri‧tant [countable]
1 formal something that keeps annoying you over a period of time:
Low flying aircraft are a constant irritant in this area.
2MI a substance that can make a part of your body painful and sore:
a skin irritant
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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