Something that annoys
The salt is a corrosive irritant poison when taken internally.
When salicin is taken internally no irritant action occurs, nor is there any antisepsis.
It possesses the advantage of exercising but little irritant effect upon the bowels.
Colchicum or colchicine, when applied to the skin, acts as a powerful irritant, causing local pain and congestion.
The permanganate of potash is an irritant if used pure.