D defs.my
Entry 1 sense Webster, 1913

Codeine

/(kō"dēn or kō̇*dē"ĭn)/ · Co·deine · IPA /ˈkoʊˌdiːn/
01 n. One of the opium alkaloids; a white crystalline substance, C18H21NO3, similar to and regarded as a derivative of morphine, but much feebler…
  1. 1.
    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.(Chem.) Also: codeia