Irritability
Irritability Ir`ri*ta*bil"i*ty, n. [L. irritabilitas: cf. F. irritabilit['e].] [1913 Webster] 1. The state or quality of being irritable; quick excitability; petulance; fretfulness; as, irritability of temper. [1913 Webster]

2. (Physiol.) 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; esp., the property which living muscle possesses, 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. [1913 Webster]

3. (Med.) A condition of morbid excitability of an organ or part of the body; undue susceptibility to the influence of stimuli. See {Irritation}, n., 3. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

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