Main Entry: fen·ta·nyl

Pronunciation: \ˈfen-tə-ˌnil\

Function: noun

Etymology: probably alteration of phenethyl, a monovalent radical derived from ethylbenzine, from phen- + ethyl

Date: 1964

: a synthetic opioid narcotic analgesic C₂₂H₂₈N₂O with pharmacological action similar to morphine that is administered especially in the form of its citrate