/ Dictionary / Index N narcosynthesis: Meaning and Definition of Find definitions for: nar•co•syn•the•sis Pronunciation: (när"kō-sin'thu-sis), [key] — n. a treatment for psychiatric disturbances that uses narcotics. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. narcosis narcoterrorism Related Content Daily Word Quiz: lyceum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language