levorphanol
noun
lev·or·pha·nol
| \ ˌlev-ˈȯr-fə-ˌnȯl
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Medical Definition of levorphanol
: an addictive drug used especially in the form of its hydrated tartrate C17H23NO·C4H6O6·2H2O as a potent analgesic with properties similar to morphine — see levo-dromoran