noun Pharmacology.

a synthetic, short-acting narcotic analgesic and sedative, C22H28N2O, used pharmacologically in anesthesia and neuroleptanalgesia, and also as an illicit drug: Medics quickly administered fentanyl to the injured soldiers.Drug dealers are lacing heroin with fentanyl.

Origin of fentanyl

First recorded in 1960–65; contraction and respelling of the chemical name N-(1-phenethyl-4-piperidyl)propionanilide
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for fentanyl

Contemporary Examples of fentanyl

  • The story of a wayward anesthesia trainee who took a near fatal dose of fentanyl hit the news this week.

    The Daily Beast logo
    The Secret World of Drug-Addict Doctors

    Kent Sepkowitz

    April 24, 2014

  • Even if the dealer loads stamp bags with fentanyl and causes an overdose of 22 people in Pennsylvania?

    The Daily Beast logo
    Heroin: America’s Silent Assassin

    Dr. Anand Veeravagu, MD, Robert M. Lober, MD, PhD

    February 3, 2014

British Dictionary definitions for fentanyl



a narcotic drug used in medicine to relieve pain
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

fentanyl in Medicine




A narcotic analgesic used in combination with other drugs before, during, or following surgery.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.