The Collaborative International Dictionary of English v.0.48:

Paralgesia \Par`al*ge"si*a\, n. [NL.; para- + Gr. 'a`lghsis
   sense of pain.] (Med.)
   Disordered sensibility to pain, including absence of
   sensibility to pain, excessive sensibility to pain, and
   abnormal painful results of stimuli. -- Par`al*ge"sic, a.
   [Webster 1913 Suppl.]