Ir″ri‐ta‐ble (?), a. [L. irritabilis: cf. F. irritable. See Irritate.]
1. Capable of being irritated.
2. Very susceptible of anger or passion; easily inflamed or exasperated; as, an irritable temper.
Vicious, old, and irritable. Tennyson.
3. (Physiol.) Endowed with irritability; susceptible of irritation; capable of being excited to action by the application of certain stimuli.
4. (Med.) Susceptible of irritation; unduly sensitive to irritants or stimuli. See Irritation, n., 3.
Syn. — Excitable; irascible; touchy; fretful; peevish.