The act of irritating or annoying / The state of being irritated / A things or person that annoys / (physiology) a state of inflammation or painful reaction to allergy or cell-lining damage.

Relating to irritation.

plural of irritation

serving to excite or irritate / accompanied with, or produced by, increased action or irritation

Any substance causing irritation; an irritant.

The quality of being irritant or irritating. / (law, Scotland) The state or quality of being null and void; invalidity

One who or that which irritates.

plural of irritancy

plural of irritative

plural of irritability