- (n.) The state or quality of being irritable; quick excitability; petulance; fretfulness; as, irritability of temper.
- (n.) A condition of morbid excitability of an organ or part of the body; undue susceptibility to the influence of stimuli. See Irritation, n., 3.
- (n.) A natural susceptibility, characteristic of all living organisms, tissues, and cells, to the influence of certain stimuli, response being manifested in a variety of ways, -- as that quality in plants by which they exhibit motion under suitable stimulation; especially, the property which living muscle processes, of responding either to a direct stimulus of its substance or to the stimulating influence of its nerve fibers, the response being indicated by a change of form or contraction; contractility.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). irritability. Retrieved September 21, 2026, from http://smartdefine.org/irritability/definitions/2023843 |
| Chicago | Webster's. 2011. "irritability" http://smartdefine.org/irritability/definitions/2023843 (accessed September 21, 2026). |
| Harvard | Webster's 2011, irritability, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/irritability/definitions/2023843>. |
| MLA | Webster's. "irritability" 27 May 2011. Web. 21 September 2026. <http://smartdefine.org/irritability/definitions/2023843> |