v. t. - To render null and void.
v. t. - To increase the action or violence of; to heighten excitement in; to intensify; to stimulate.
v. t. - 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.
v. t. - To produce irritation in; to stimulate; to cause to contract. See Irritation, n., 2.
n. - To make morbidly excitable, or oversensitive; to fret; as, the skin is irritated by friction; to irritate a wound by a coarse bandage.
a. - Excited; heightened.