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We found 44 dictionaries with English definitions that include the word vitamin:
Click on the first link on a line below to go directly to a page where "vitamin" is defined.

General (28 matching dictionaries)

1. vitamin: Merriam-Webster.com [home, info]
2. vitamin: Oxford Learner's Dictionaries [home, info]
3. vitamin: American Heritage Dictionary of the English Language [home, info]
4. vitamin: Collins English Dictionary [home, info]
5. vitamin: Vocabulary.com [home, info]
6. vitamin: Macmillan Dictionary [home, info]
7. Vitamin, vitamin: Wordnik [home, info]
8. vitamin: Cambridge Advanced Learner's Dictionary [home, info]
9. vitamin: Wiktionary [home, info]
10. vitamin: Webster's New World College Dictionary, 4th Ed. [home, info]
11. vitamin: The Wordsmyth English Dictionary-Thesaurus [home, info]
12. vitamin: Infoplease Dictionary [home, info]
13. vitamin: Dictionary.com [home, info]
14. vitamin: Online Etymology Dictionary [home, info]
15. vitamin: UltraLingua English Dictionary [home, info]
16. vitamin: Cambridge Dictionary of American English [home, info]
17. Vitamin (TV series), Vitamin (disambiguation), Vitamin: Wikipedia, the Free Encyclopedia [home, info]
18. vitamin: Rhymezone [home, info]
19. Vitamin (m), vitamin: AllWords.com Multi-Lingual Dictionary [home, info]
20. vitamin: Stammtisch Beau Fleuve Acronyms [home, info]
21. Vitamin: Encarta® Online Encyclopedia, North American Edition [home, info]
22. vitamin: Free Dictionary [home, info]
23. vitamin: Mnemonic Dictionary [home, info]
24. vitamin: WordNet 1.7 Vocabulary Helper [home, info]
25. vitamin: LookWAYup Translating Dictionary/Thesaurus [home, info]
26. vitamin: Dictionary/thesaurus [home, info]

Computing (1 matching dictionary)

27. vitamin: Encyclopedia [home, info]

Medicine (12 matching dictionaries)

28. vitamin: Chronic Fatigue Syndrome Glossary [home, info]
29. Vitamin(s): Merck Manuals [home, info]
30. vitamin: Chronic Fatigue Syndrome [home, info]
31. Vitamin: MedFriendly Glossary [home, info]
32. vitamin: online medical dictionary [home, info]
33. Vitamin: Hepatitis C Information Central [home, info]
34. Vitamin: AIDS Medical Glossary and Drug Chart [home, info]
35. vitamin: Dictionary of Cancer Terms [home, info]
36. vitamin: Parents' Common Sense Encyclopedia [home, info]
37. Vitamin: Microbial Genetics Glossary [home, info]
38. vitamin: Glossary of HIV/AIDS Related Terms [home, info]
39. vitamin: Medical dictionary [home, info]

Miscellaneous (1 matching dictionary)

40. VITAMIN: Acronym Finder [home, info]

Science (1 matching dictionary)

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

Slang (1 matching dictionary)

42. vitamin: Urban Dictionary [home, info]

(Note: See vitamins for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (vitamin) ▸ noun:  any of a group of organic substances essential in small quantities to normal metabolism ▸ Also see vitamins ▸ Word origin ▸ Words similar to vitamin ▸ Usage examples for vitamin ▸ Idioms related to vitamin (New!) ▸ Popular adjectives describing vitamin ▸ Words that often appear near vitamin ▸ Rhymes of vitamin ▸ Invented words related to vitamin