Breadcrumb Home > 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: guilloche Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language