levorphanol

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

noun Pharmacology.

a potent synthetic narcotic analgesic, C21H29NO7, as the tartrate, used in the treatment of moderate to severe pain.

Origin of levorphanol

lev- + (methylm)orph(in)an a chemical component + -ol1