Quick definitions from WordNet (irritate)
▸ verb: 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")
▸ verb: excite to an abnormal condition, of chafe or inflame ("Aspirin irritates my stomach")
▸ verb: cause annoyance in; disturb, especially by minor irritations ("It irritates me that she never closes the door after she leaves")
▸ Also see irritate
▸ verb: 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")
▸ verb: excite to an abnormal condition, of chafe or inflame ("Aspirin irritates my stomach")
▸ verb: cause annoyance in; disturb, especially by minor irritations ("It irritates me that she never closes the door after she leaves")
▸ Also see irritate