Usually means: Powerful synthetic opioid, highly potent.
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We found 26 dictionaries that define the word fentanyl:

General (14 matching dictionaries)
  1. fentanyl: Merriam-Webster
  2. fentanyl: Oxford Learner's Dictionaries
  3. fentanyl: American Heritage Dictionary of the English Language
  4. fentanyl: Collins English Dictionary
  5. Fentanyl: Vocabulary.com
  6. Fentanyl, fentanyl: Wordnik
  7. fentanyl: Wiktionary
  8. fentanyl: Infoplease Dictionary
  9. fentanyl: Dictionary.com
  10. Fentanyl: Wikipedia, the Free Encyclopedia
  11. Fentanyl: Rhymezone
  12. fentanyl: Mnemonic Dictionary
  13. fentanyl: TheFreeDictionary.com
  14. fentanyl: FreeDictionary.org

Medicine (11 matching dictionaries)
  1. fentanyl: Merriam-Webster Medical Dictionary
  2. Dorland's Illustrated Medical Dictionary (No longer online)
  3. Medical Dictionary (No longer online)
  4. Breast Cancer Talking Dictionary (No longer online)
  5. Fentanyl: Merck Manuals
  6. online medical dictionary (No longer online)
  7. Hepatitis C Information Central (No longer online)
  8. Collaborative Hypertext of Radiology (No longer online)
  9. RxList The Internet Drug Index (No longer online)
  10. fentanyl: Medical dictionary
  11. Hyperdictionary (No longer online)

Slang (1 matching dictionary)
  1. fentanyl: Urban Dictionary

(Note: See fentanyls as well.)

Definitions from Wiktionary (fentanyl)

noun:  (pharmacology) 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); N-phenyl-N-[1-(2-phenylethyl)piperidin-4-yl]propanamide.

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