Breadcrumb Home > Dictionary > Index N narcolepsy: Meaning and Definition of Find definitions for: nar•co•lep•sy Pronunciation: (när'ku-lep"sē), [key] — n. Pathol. a condition characterized by frequent and uncontrollable periods of deep sleep. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: narcolepsy (Thesaurus) narcodiagnosis narcoma ✖ Related Content Daily Word Quiz: umbrage Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language