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Definition of: codeine
(kō′dēn, kō′di·ēn) noun Chem.
A white crystalline alkaloid, C18H21NO3, derived from morphine and widely used in medicine as a mild narcotic. Also co·de·in (kō′dē·in, kō′·dēn), co·de·ia (kō·dē′ə). [<Gk. kōdeia head of a poppy]
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