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We found 46 dictionaries with English definitions that include the word caffeine:
Click on the first link on a line below to go directly to a page where "caffeine" is defined.

General dictionaries General (30 matching dictionaries)
  1. caffeine: Merriam-Webster.com [home, info]
  2. caffeine: Oxford Learner's Dictionaries [home, info]
  3. caffeine: American Heritage Dictionary of the English Language [home, info]
  4. caffeine: Collins English Dictionary [home, info]
  5. caffeine: Vocabulary.com [home, info]
  6. caffeine: Macmillan Dictionary [home, info]
  7. Caffeine, caffeine: Wordnik [home, info]
  8. caffeine: Cambridge Advanced Learner's Dictionary [home, info]
  9. caffeine: Wiktionary [home, info]
  10. caffeine: Webster's New World College Dictionary, 4th Ed. [home, info]
  11. caffeine (caffein): The Wordsmyth English Dictionary-Thesaurus [home, info]
  12. caffeine: Infoplease Dictionary [home, info]
  13. caffeine: Dictionary.com [home, info]
  14. caffeine: Online Etymology Dictionary [home, info]
  15. caffeine: UltraLingua English Dictionary [home, info]
  16. caffeine: Cambridge Dictionary of American English [home, info]
  17. Caffeine (data page), Caffeine (disambiguation), Caffeine (film), Caffeine (service), Caffeine (video game), Caffeine: Wikipedia, the Free Encyclopedia [home, info]
  18. Caffeine: Online Plain Text English Dictionary [home, info]
  19. caffeine: Webster's Revised Unabridged, 1913 Edition [home, info]
  20. caffeine: Rhymezone [home, info]
  21. caffeine: AllWords.com Multi-Lingual Dictionary [home, info]
  22. Caffeine: Encarta® Online Encyclopedia, North American Edition [home, info]
  23. Caffeine: 1911 edition of the Encyclopedia Britannica [home, info]
  24. caffeine: Free Dictionary [home, info]
  25. caffeine: Mnemonic Dictionary [home, info]
  26. caffeine: WordNet 1.7 Vocabulary Helper [home, info]
  27. caffeine: LookWAYup Translating Dictionary/Thesaurus [home, info]
  28. caffeine: Dictionary/thesaurus [home, info]

Art dictionaries Art (2 matching dictionaries)
  1. Caffeine: Epicurus.com Tea Glossary [home, info]
  2. Caffeine: Epicurus.com Coffee Glossary [home, info]

Computing dictionaries Computing (1 matching dictionary)
  1. caffeine: Encyclopedia [home, info]

Medicine dictionaries Medicine (9 matching dictionaries)
  1. Caffeine: MedTerms.com Medical Dictionary [home, info]
  2. Caffeine: Medical Dictionary [home, info]
  3. Caffeine: Merck Manuals [home, info]
  4. caffeine: online medical dictionary [home, info]
  5. caffeine: Dictionary of Cancer Terms [home, info]
  6. caffeine: Parents' Common Sense Encyclopedia [home, info]
  7. caffeine: Medical dictionary [home, info]
  8. Caffeine: Drug Medical Dictionary [home, info]
  9. caffeine: Hyperdictionary [home, info]

Science dictionaries Science (1 matching dictionary)
  1. caffeine: General Chemistry Online [home, info]

Sports dictionaries Sports (1 matching dictionary)
  1. Caffeine: Body Building [home, info]

Tech dictionaries Tech (2 matching dictionaries)
  1. Caffeine: Coffee Glossary [home, info]
  2. Caffeine: Chemical Fact Sheet [home, info]

(Note: See caffeines for more definitions.)

Quick definitions from Macmillan (
American English Definition British English Definition

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Quick definitions from WordNet (caffeine)

noun:  a bitter alkaloid found in coffee and tea that is responsible for their stimulating effects

▸ Also see caffeines
Word origin

Words similar to caffeine

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Phrases that include caffeine:   caffeine addict, caffeine aspirin phenacetin, caffeine free, caffeine pills, caffeine alcohol, more...

Words similar to caffeine:   caffein, more...

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