IRRITATION

annoyance, annoying, irritation, vexation

(noun) the act of troubling or annoying someone

aggravation, irritation, provocation

(noun) unfriendly behavior that causes anger or resentment

discomfort, soreness, irritation

(noun) an uncomfortable feeling of mental painfulness or distress

pique, temper, irritation

(noun) a sudden outburst of anger; “his temper sparked like damp firewood”

excitation, innervation, irritation

(noun) the neural or electrical arousal of an organ or muscle or gland

irritation, annoyance, vexation, botheration

(noun) the psychological state of being irritated or annoyed

irritation

(noun) (pathology) abnormal sensitivity to stimulation; “any food produced irritation of the stomach”

Source: WordNet® 3.1

Etymology

Noun

irritation (countable and uncountable, plural irritations)

The act of irritating or annoying

The state of being irritated

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; especially, 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.

Source: Wiktionary

Ir`ri*ta"tion, n. Etym: [L. irritatio: cf. F. irritation.]

1. 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 whole body of the arts and sciences composes one vast machinery for the irritation and development of the human intellect. De Quincey.

2. (Physiol.)

Definition: 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.

3. (Med.)

Definition: 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.

Source: Webster’s Unabridged Dictionary 1913 Edition