Definition of narcoleptic in US English:

narcoleptic

adjective

Medicine
  • 1Affected by or relating to an extreme tendency to fall asleep.

    ‘he is narcoleptic, so he takes a drug that helps keep him awake’
    ‘a narcoleptic coma’
    1. 1.1 Tending to induce sleep; soporific.
      ‘narcoleptic drugs’
      figurative ‘a plot so tired it's narcoleptic’

noun

Medicine
  • A person affected by an extreme tendency to fall asleep.

    ‘a narcoleptic who falls asleep up against the wall’

Pronunciation

narcoleptic

/ˌnɑrkəˈlɛptɪk//ˌnärkəˈleptik/