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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 (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 (2 matching dictionaries)

29. Caffeine: Epicurus.com Tea Glossary [home, info]
30. Caffeine: Epicurus.com Coffee Glossary [home, info]

Computing (1 matching dictionary)

31. caffeine: Encyclopedia [home, info]

Medicine (9 matching dictionaries)

32. Caffeine: MedTerms.com Medical Dictionary [home, info]
33. Caffeine: Medical Dictionary [home, info]
34. Caffeine: Merck Manuals [home, info]
35. caffeine: online medical dictionary [home, info]
36. caffeine: Dictionary of Cancer Terms [home, info]
37. caffeine: Parents' Common Sense Encyclopedia [home, info]
38. caffeine: Medical dictionary [home, info]
39. Caffeine: Drug Medical Dictionary [home, info]
40. caffeine: Hyperdictionary [home, info]

Science (1 matching dictionary)

41. caffeine: General Chemistry Online [home, info]

Sports (1 matching dictionary)

42. Caffeine: Body Building [home, info]

Tech (2 matching dictionaries)

43. Caffeine: Coffee Glossary [home, info]
44. Caffeine: Chemical Fact Sheet [home, info]

(Note: See caffeines for more definitions.)

Quick definitions from Macmillan ( ) Provided by 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 ▸ Usage examples for caffeine ▸ Idioms related to caffeine (New!) ▸ Popular adjectives describing caffeine ▸ Words that often appear near caffeine ▸ Rhymes of caffeine ▸ Invented words related to caffeine