Irritant
(noun)
A substance or condition that causes irritation.
Origin:
From latin irritant-, present participle stem of irritare ("to provoke, excite").
Examples:
- The dust was an irritant to her allergies.
- The constant noise from the construction site was an irritant to her.
- The strong scent of perfume was an irritant to his nose.
- The rough fabric was an irritant to her skin.
- The spicy food was an irritant to his stomach.