Irritation

The act of irritating, or exciting, or the state of being irritated; excitement; stimulation, usually of an undue and uncomfortable kind; especially, excitement of anger or passion; provocation; annoyance; anger.

The act of exciting, or the condition of being excited to action, by stimulation; -- as, the condition of an organ of sense, when its nerve is affected by some external body; esp., the act of exciting muscle fibers to contraction, by artificial stimulation; as, the irritation of a motor nerve by electricity; also, the condition of a muscle and nerve, under such stimulation.

A condition of morbid excitability or oversensitiveness of an organ or part of the body; a state in which the application of ordinary stimuli produces pain or excessive or vitiated action.

(pathology) abnormal sensitivity to stimulation; "any food produced irritation of the stomach"

the psychological state of being irritated or annoyed

an uncomfortable feeling of mental painfulness or distress

a sudden outburst of anger; "his temper sparked like damp firewood"

the neural or electrical arousal of an organ or muscle or gland