/ Dictionary / Index N narceine: Meaning and Definition of Find definitions for: nar•ce•ine Pronunciation: (när'sē-ēn", -in), [key] — n. Pharm. a narcotic alkaloid, CHNO, occurring in opium and acting as a mild relaxant on smooth muscle. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. narc narcissism 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