narceine

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A bitter crystalline alkaloid, C₂₃H₂₇NO₈, obtained from opium and formerly used in medicine as a substitute for morphine.

Century Dictionary and Cyclopedia

1. n. An alkaloid (C₂₃H₂₉NO₉) contained in opium. It is sparingly soluble in water and alcohol. It forms fine silky inodorous bitter crystals. Narceine is sometimes used in medicine as a substitute for morphine.
2. n. An acid coal-tar color of the monoazo type, prepared by combining diazotized sulphanilic acid with β-naph-thol and then treating the product with sodium bisulphite. It dyes wool orange in an acid bath, but is chiefly used in textile-printing.

Wiktionary

1. n. pharmacy An alkaloid contained in opium, occurring as fine white, silky crystals, slightly soluble in water, used as a substitute for morphine.

GNU Webster's 1913

1. n. (Chem.) An alkaloid found in small quantities in opium, and extracted as a white crystalline substance of a bitter astringent taste. It is a narcotic. Called also narceia.