Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A narcotic drug, C18H21NO3, derived from morphine and used in the form of its hydrochloride as an analgesic.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. An opiate analogue, a methylated derivative of hydromorphone used as an analgesic.

Etymologies

met(hyldihydr)o(mor)p(hin)on(e).
(American Heritage® Dictionary of the English Language, Fourth Edition)

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