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We found 45 dictionaries with English definitions that include the word vitamin a:
Click on the first link on a line below to go directly to a page where "vitamin a" is defined.

General (22 matching dictionaries)

1. vitamin a: Free Dictionary [home, info]
2. vitamin a: Mnemonic Dictionary [home, info]
3. vitamin a: WordNet 1.7 Vocabulary Helper [home, info]
4. vitamin A: LookWAYup Translating Dictionary/Thesaurus [home, info]
5. vitamin A: Dictionary/thesaurus [home, info]
6. vitamin A: Merriam-Webster.com [home, info]
7. vitamin A: Oxford Dictionaries [home, info]
8. vitamin A: American Heritage Dictionary of the English Language [home, info]
9. vitamin A: Collins English Dictionary [home, info]
10. vitamin A: Vocabulary.com [home, info]
11. vitamin A: Macmillan Dictionary [home, info]
12. vitamin a: Wordnik [home, info]
13. vitamin a, vitamin A: Cambridge Advanced Learner's Dictionary [home, info]
14. vitamin A: Wiktionary [home, info]
15. vitamin A: The Wordsmyth English Dictionary-Thesaurus [home, info]
16. vitamin A: Infoplease Dictionary [home, info]
17. vitamin A: Dictionary.com [home, info]
18. vitamin A: UltraLingua English Dictionary [home, info]
19. Vitamin A, Vitamin a: Wikipedia, the Free Encyclopedia [home, info]
20. vitamin a: Rhymezone [home, info]

Art (1 matching dictionary)

21. Vitamin A: Health & Beauty Glossary [home, info]

Computing (1 matching dictionary)

22. vitamin A: Encyclopedia [home, info]

Medicine (15 matching dictionaries)

23. Vitamin A (retinol): Merck Manuals [home, info]
24. vitamin A: online medical dictionary [home, info]
25. Vitamin A: Hepatitis C Information Central [home, info]
26. Vitamin A: MEDLINE plus Illustrated Medical Encyclopedia [home, info]
27. Vitamin A: Glossary of Herbs, Botanicals and Other Products [home, info]
28. vitamin A: Dictionary of Cancer Terms [home, info]
29. vitamin A: Glossary of HIV/AIDS Related Terms [home, info]
30. vitamin A: Medical dictionary [home, info]
31. Vitamin A: University of Maryland Glossary of Medical Terms [home, info]
32. Vitamin A: Vitamin Glossary [home, info]
33. Vitamin A: Drug Medical Dictionary [home, info]
34. vitamin a: Hyperdictionary [home, info]
35. Vitamin A: MedTerms.com Medical Dictionary [home, info]
36. Vitamin A: Medical Dictionary [home, info]
37. vitamin A: Breast Cancer Talking Dictionary [home, info]

Science (1 matching dictionary)

38. vitamin A: Evolution Glossary [home, info]

Slang (1 matching dictionary)

39. Vitamin A, vitamin-a: Urban Dictionary [home, info]

Sports (1 matching dictionary)

40. Vitamin A: Body Building [home, info]

Tech (3 matching dictionaries)

41. VITAMIN A: Farrier & Hoofcare [home, info]
42. Vitamin A: Beauty & Health Glossary [home, info]
43. Vitamin A: Beauty Glossary [home, info]

(Note: See vitamin_as for more definitions.)

Quick definitions from WordNet (vitamin a) ▸ noun:  any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes ▸ Also see vitamin_as ▸ Words similar to vitamin a ▸ Usage examples for vitamin a ▸ Words that often appear near vitamin a ▸ Rhymes of vitamin a ▸ Invented words related to vitamin a