Webster's Revised Unabridged Dictionary · 1913

Irritate

Irritate , transitive verb

[See 1 st Irritant.]

To render null and void. [Rare] — Abp. Bramhall

Irritate , transitive verb

[Latin irritatus, past participle of irritare. Of doubtful origin.]

1.
To increase the action or violence of; to heighten excitement in; to intensify; to stimulate.
Cold maketh the spirits vigorous and irritateth them. — Bacon
2.
To excite anger or displeasure in; to provoke; to tease; to exasperate; to annoy; to vex; as, the insolence of a tyrant irritates his subjects.
Dismiss the man, nor irritate the god: Prevent the rage of him who reigns above. — Pope
3.
(Physiology) To produce irritation in; to stimulate; to cause to contract. See Irritation, n., 2.
4.
(Medicine) To make morbidly excitable, or oversensitive; to fret; as, the skin is irritated by friction; to irritate a wound by a coarse bandage.

Irritate , adjective

Excited; heightened. [Obsolete]