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2 definitions found
 for irritability
From The Collaborative International Dictionary of English v.0.48 :

  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]

From WordNet (r) 3.0 (2006) :

  irritability
      n 1: an irritable petulant feeling [syn: irritability,
           crossness, fretfulness, fussiness, peevishness,
           petulance, choler]
      2: excessive sensitivity of an organ or body part [syn:
         excitability, irritability]
      3: a disposition to exhibit uncontrolled anger; "his temper was
         well known to all his employees" [syn: temper,
         biliousness, irritability, peevishness, pettishness,
         snappishness, surliness]

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