Definition of narcolepsy noun from the Oxford Advanced Learner's Dictionary

 

narcolepsy

 noun
noun
BrE BrE//ˈnɑːkəʊlepsi//
 
; NAmE NAmE//ˈnɑːrkoʊlepsi//
 
[uncountable](medical)
 
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a condition in which somebody falls into a deep sleep when they are in relaxing surroundings Word Origin late 19th cent.: from Greek narkē ‘numbness’, on the pattern of epilepsy.
See the Oxford Advanced American Dictionary entry: narcolepsy