from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A narcotic alkaloid, C18H21NO4, related to codeine, used as an analgesic and a sedative chiefly in the form of its hydrochloride salt.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A very powerful and potentially addictive opioid analgesic medication synthesized from thebaine.
(hydr)oxy + cod(eine) + -one.(American Heritage® Dictionary of the English Language, Fourth Edition)