Webster’s Revised Unabridged Dictionary · 1913
Codeine
Co·de′ine (kō·dē′ĭn), n. [Gr. κώδεια poppy head: cf. F. codéine.] (Chem.) One of the opium alkaloids; a white crystalline substance, C18H21NO3, similar to and regarded as a derivative of morphine, but much feebler in its action; — called also codeia.