WordReference Random House Unabridged Dictionary of American English © 2026
bu•tor•pha•nol
(byo̅o̅ tôr′fə nôl′, -nol′),USA pronunciation n. [Pharm.]
- Drugsa narcotic analgesic, C21H29NO2, administered by injection to treat moderate to severe pain.
- as contraction of the chemical name 17-(cyclobutylmethyl)morphinan-3,14-diol