Definition of irritant

"Irritant" stems from the Latin word "irritare," meaning "to provoke, to excite, to stimulate." This concept of "provocation" evolved into the modern meaning of "irritant" - something that causes irritation, discomfort, or inflammation. The word "irritare" itself has roots in the Latin verb "erigere," meaning "to raise, to set upright." This connection highlights the idea of a physical response, like a raised rash or inflammation, being triggered by an irritant.