Source : Webster's Revised Unabridged Dictionary (1913)

Epileptic \Ep`i*lep"tic\, a. [L. epilepticus, Gr. ? : cf. F.
   ['e]pileptique.]
   Pertaining to, affected with, or of the nature of, epilepsy.

Epileptic \Ep`i*lep"tic\, n.
   1. One affected with epilepsy.

   2. A medicine for the cure of epilepsy.

Source : WordNet®

epileptic
     adj : of or relating to or characteristic of epilepsy; "epileptic
           seizure"
     n : a person who has epilepsy