fentanyl

noun

fen·​ta·​nyl ˈfen-tə-ˌnil How to pronounce fentanyl (audio)
: a synthetic opioid narcotic analgesic C22H28N2O with pharmacological action similar to morphine that is administered transdermally as a skin patch and in the form of its citrate C22H28N2O·C6H8O7 is administered orally or parenterally (as by intravenous or epidural injection)

Examples of fentanyl in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
The Trump administration, for example, has placed 25% tariffs on Canada and Mexico and 20% on China to incentivize them to reduce the flow of fentanyl into the United States. David Goldman, CNN Money, 7 July 2025 These measures allow individuals to test their drugs for the presence of fentanyl and have immediate access to overdose-reversing medication. Andrew Yockey, The Conversation, 3 July 2025 In a statement at the time, the U.S. Treasury Department said the group facilitates the production and trafficking of fentanyl. Sophia Compton, FOXNews.com, 1 July 2025 Some higher tariffs, such as those imposed by Washington related to the trade in fentanyl and duties on aluminum and steel, remain in place. Emma Burleigh, Fortune, 27 June 2025 See All Example Sentences for fentanyl

Word History

Etymology

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

First Known Use

1964, in the meaning defined above

Time Traveler
The first known use of fentanyl was in 1964

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Cite this Entry

“Fentanyl.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/fentanyl. Accessed 10 Jul. 2025.

Medical Definition

fentanyl

noun
fen·​ta·​nyl ˈfent-ᵊn-ˌil How to pronounce fentanyl (audio)
: a synthetic opioid narcotic analgesic C22H28N2O with pharmacological action similar to morphine that is administered transdermally as a skin patch and in the form of its citrate C22H28N2O·C6H8O7 is administered orally or parenterally

Note: Fentanyl is marketed under the trademark Actiq.

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