Wordnet 3.0
NOUN (1)
1.
an abnormally high degree of irritability or sensitivity to stimulation of an organ or body part;
The Collaborative International Dictionary of English v.0.48:
Erethism \Er"e*thism\, n. [Gr. ? irritation, fr. ? to stir,
rouse, fr. ? to stir: cf. F. ['e]r['e]thisme.] (Med.)
A morbid degree of excitement or irritation in an organ.
--Hoblyn.
[1913 Webster]
WordNet (r) 3.0 (2006):
erethism
n 1: an abnormally high degree of irritability or sensitivity to
stimulation of an organ or body part