Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English


English definition of “irritant”


noun [C]     /ˈɪrɪtənt/
ANNOYING someone or something that makes you feel annoyed Causing feelings of anger and displeasure
SUBSTANCE a substance that makes part of your body hurt Pain and painful
(Definition of irritant noun from the Cambridge Learner's Dictionary © Cambridge University Press)

Definitions of “irritant” in other dictionaries

Word of the Day

best man

a male friend or relation of the bridegroom who stands with him and helps him during a marriage ceremony

Word of the Day


Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More