Erethism Definition
 ĕrə-thĭzəm 
    noun
  
 An abnormal extreme irritability or sensitivity of an organ, tissue, etc.
 Webster's New World 
Any unusual or morbid overexcitement.
Wiktionary 
Origin of Erethism
-  
From French éréthisme, from Ancient Greek ἐρεθισμός (erethismos), from ἐρεθίζειν (erethizein, “to irritate”).
From Wiktionary
 French éréthisme from Greek erethisma a provocation from erethizein to irritate
From American Heritage Dictionary of the English Language, 5th Edition
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