Meaning of irritate

(verb) cause annoyance in; disturb, especially by minor irritations; "Mosquitoes buzzing in my ear really bothers me"; "It irritates me that she never closes the door after she leaves"

excite to an abnormal condition, or chafe or inflame; "Aspirin irritates my stomach"

excite to some characteristic action or condition, such as motion, contraction, or nervous impulse, by the application of a stimulus; "irritate the glands of a leaf"