ˈkō(ˌ)dēn, -_dēə̇n, -dēˌēn noun
( -s )
Etymology: French codéine, from Greek kōdeia poppyhead (from kōos cavity) + French -ine -ine; akin to Greek koilos hollow — more at cave
: a crystalline alkaloid C 18 H 21 NO 3 .H 2 O associated in opium with morphine, usually made from morphine, and similar to the latter but feebler in its action; morphine methyl ether