ep·i·lep·sy 
(ĕpə-lĕp′sē)
(ĕpə-lĕp′sē)n. pl. ep·i·lep·sies
Any of various neurological disorders marked by sudden recurring attacks of motor, sensory, or cognitive dysfunction, with or without convulsive seizures or loss of consciousness. Also called seizure disorder.
[French épilepsie, from Latin epilēpsia, from Greek epilēpsis, from epilambanein, epilēp-, to lay hold of : epi-, epi- + lambanein, to seize.]