(n.) 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.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). codeine. Retrieved September 22, 2026, from http://smartdefine.org/codeine/definitions/1988661 |
| Chicago | Webster's. 2011. "codeine" http://smartdefine.org/codeine/definitions/1988661 (accessed September 22, 2026). |
| Harvard | Webster's 2011, codeine, Smart Define, viewed 22 September, 2026, <http://smartdefine.org/codeine/definitions/1988661>. |
| MLA | Webster's. "codeine" 27 May 2011. Web. 22 September 2026. <http://smartdefine.org/codeine/definitions/1988661> |