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From The Collaborative International Dictionary of English v.0.48:
Narceine \Nar"ce*ine\, n. [L. narce numbness, torpor, Gr. ?????: cf. F. narc['e]["i]ne.] (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. [1913 Webster]