Webster's English Dictionary

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irritability

ir.ri.ta.bil.i.ty \.ir-*t-*-'bil-*t-e-\ n : the quality or state of being 
   irritable : as  : quick excitability to annoyance, impatience, or anger : 
   PETULANCE)M : abnormal or excessive excitability of an organ or part of the 
   body  : the property of protoplasm and of living organisms that permits 
   them to  react to stimuli