irritant - definition and synonyms

noun [countable] 

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/ˈɪrɪt(ə)nt/
singularirritant
pluralirritants
  1. 1
    something that annoys you

    The government sees the rebels as little more than a minor irritant.

  2. 2
    a substance that hurts a part of your body and makes it painful, red, or swollen