One of the mysteries of the English language finally explained.
A narcotic analgesic derived from morphine, usually administered as the hydrochloride; dihydromethylmorphinone, C₁₈H₂₁NO₃.
1940s; earliest use found in Journal of the American Medical Association. Perhaps from met- + -o (in hydro-) + -p- + -on (in -one).
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