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We found 38 dictionaries with English definitions that include the word heroin:
Click on the first link on a line below to go directly to a page where "heroin" is defined.

General (28 matching dictionaries)

1. heroin: Merriam-Webster.com [home, info]
2. heroin: Oxford Learner's Dictionaries [home, info]
3. heroin: American Heritage Dictionary of the English Language [home, info]
4. heroin: Collins English Dictionary [home, info]
5. heroin: Vocabulary.com [home, info]
6. heroin: Macmillan Dictionary [home, info]
7. Heroin, heroin: Wordnik [home, info]
8. heroin: Cambridge Advanced Learner's Dictionary [home, info]
9. heroin: Wiktionary [home, info]
10. heroin: Webster's New World College Dictionary, 4th Ed. [home, info]
11. heroin: The Wordsmyth English Dictionary-Thesaurus [home, info]
12. heroin: Infoplease Dictionary [home, info]
13. heroin: Dictionary.com [home, info]
14. heroin: Online Etymology Dictionary [home, info]
15. heroin: UltraLingua English Dictionary [home, info]
16. heroin: Cambridge Dictionary of American English [home, info]
17. 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 [home, info]
18. heroin: Rhymezone [home, info]
19. Heroin (nt), heroin: AllWords.com Multi-Lingual Dictionary [home, info]
20. heroin: All About Homonyms [home, info]
21. heroin: Free Dictionary [home, info]
22. heroin: Mnemonic Dictionary [home, info]
23. heroin: WordNet 1.7 Vocabulary Helper [home, info]
24. heroin: LookWAYup Translating Dictionary/Thesaurus [home, info]
25. heroin: Dictionary/thesaurus [home, info]
26. heroin: Wikimedia Commons US English Pronunciations [home, info]

Computing (1 matching dictionary)

27. heroin: Encyclopedia [home, info]

Medicine (8 matching dictionaries)

28. Heroin: MedTerms.com Medical Dictionary [home, info]
29. Heroin: Medical Dictionary [home, info]
30. Heroin: Merck Manuals [home, info]
31. heroin: online medical dictionary [home, info]
32. HEROIN: Probert Encyclopaedia of Medicine [home, info]
33. heroin: Dictionary of Cancer Terms [home, info]
34. heroin: Medical dictionary [home, info]
35. Heroin: Drug Medical Dictionary [home, info]

Slang (1 matching dictionary)

36. Heroin: Totally Unofficial Rap [home, info]

(Note: See heroins for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (heroin) ▸ noun:  a narcotic that is considered a hard drug; a highly addictive morphine derivative; intravenous injection provides the fastest and most intense rush ▸ Also see heroins ▸ Word origin ▸ Words similar to heroin ▸ Usage examples for heroin ▸ Idioms related to heroin (New!) ▸ Popular adjectives describing heroin ▸ Words that often appear near heroin ▸ Rhymes of heroin ▸ Invented words related to heroin