Usually means: Powerful, addictive, illegal opioid drug.
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We found 34 dictionaries that define the word heroin:

General (23 matching dictionaries)
  1. heroin: Merriam-Webster.com
  2. heroin: Oxford Learner's Dictionaries
  3. heroin: American Heritage Dictionary of the English Language
  4. heroin: Collins English Dictionary
  5. heroin: Vocabulary.com
  6. Heroin, heroin: Wordnik
  7. heroin: Cambridge Advanced Learner's Dictionary
  8. heroin: Wiktionary
  9. heroin: Webster's New World College Dictionary, 4th Ed.
  10. heroin: The Wordsmyth English Dictionary-Thesaurus
  11. heroin: Infoplease Dictionary
  12. heroin: Dictionary.com
  13. heroin: Online Etymology Dictionary
  14. heroin: Cambridge Essential American English Dictionary
  15. Heroin(e), Heroin (Billy Idol song), Heroin (Buck-Tick song), Heroin (The Velvet Underground song), Heroin (Z-Ro album), Heroin (album), Heroin (band), Heroin (disambiguation), Heroin: Wikipedia, the Free Encyclopedia
  16. heroin: Rhymezone
  17. Heroin (nt), heroin: AllWords.com Multi-Lingual Dictionary
  18. heroin: Free Dictionary
  19. heroin: Mnemonic Dictionary
  20. heroin: Dictionary/thesaurus
  21. heroin: Wikimedia Commons US English Pronunciations

Computing (1 matching dictionary)
  1. heroin: Encyclopedia

Medicine (9 matching dictionaries)
  1. Dorland's Illustrated Medical Dictionary (No longer online)
  2. Heroin: MedTerms.com Medical Dictionary
  3. Medical Dictionary (No longer online)
  4. Heroin: Merck Manuals
  5. online medical dictionary (No longer online)
  6. Probert Encyclopaedia of Medicine (No longer online)
  7. heroin: Dictionary of Cancer Terms
  8. heroin: Medical dictionary
  9. Heroin: Drug Medical Dictionary

Slang (1 matching dictionary)
  1. Totally Unofficial Rap (No longer online)

(Note: See heroinism as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  A powerful and addictive drug derived from opium producing intense euphoria, classed as an illegal narcotic in most of the world.
noun:  Obsolete form of heroine. [A female hero.]

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