Source : Webster's Revised Unabridged Dictionary (1913)

Anesthesia \An`es*the"si*a\, n., Anesthetic \An`es*thet"ic\, a.
   Same as {An[ae]sthesia}, {An[ae]sthetic}.

Source : WordNet®

anesthesia
     n : loss of bodily sensation with or without loss of
         consciousness [syn: {anaesthesia}]