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levorphanol

American  
[luh-vawr-fuh-nawl, -nol] / ləˈvɔr fəˌnɔl, -ˌnɒl /

noun

Pharmacology.
  1. a potent synthetic narcotic analgesic, C 21 H 29 NO 7 , as the tartrate, used in the treatment of moderate to severe pain.


Etymology

Origin of levorphanol

lev- + (methylm)orph(in)an a chemical component + -ol 1