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We found 37 dictionaries with English definitions that include the word melatonin:
Click on the first link on a line below to go directly to a page where "melatonin" is defined.

General (24 matching dictionaries)

1. melatonin: Merriam-Webster.com [home, info]
2. melatonin: Oxford Dictionaries [home, info]
3. melatonin: American Heritage Dictionary of the English Language [home, info]
4. melatonin: Collins English Dictionary [home, info]
5. melatonin: Vocabulary.com [home, info]
6. melatonin: Macmillan Dictionary [home, info]
7. Melatonin, melatonin: Wordnik [home, info]
8. melatonin: Cambridge Advanced Learner's Dictionary [home, info]
9. melatonin: Wiktionary [home, info]
10. melatonin: Webster's New World College Dictionary, 4th Ed. [home, info]
11. melatonin: The Wordsmyth English Dictionary-Thesaurus [home, info]
12. melatonin: Infoplease Dictionary [home, info]
13. melatonin: Dictionary.com [home, info]
14. melatonin: Online Etymology Dictionary [home, info]
15. melatonin: UltraLingua English Dictionary [home, info]
16. Melatonin (album), Melatonin: Wikipedia, the Free Encyclopedia [home, info]
17. melatonin: Rhymezone [home, info]
18. melatonin: Free Dictionary [home, info]
19. melatonin: Mnemonic Dictionary [home, info]
20. melatonin: WordNet 1.7 Vocabulary Helper [home, info]
21. melatonin: LookWAYup Translating Dictionary/Thesaurus [home, info]
22. melatonin: Dictionary/thesaurus [home, info]

Computing (1 matching dictionary)

23. melatonin: Encyclopedia [home, info]

Medicine (10 matching dictionaries)

24. Melatonin: MedTerms.com Medical Dictionary [home, info]
25. Melatonin: Medical Dictionary [home, info]
26. Melatonin: Merck Manuals [home, info]
27. melatonin: online medical dictionary [home, info]
28. Melatonin: Hepatitis C Information Central [home, info]
29. Melatonin: Glossary of Herbs, Botanicals and Other Products [home, info]
30. melatonin: Dictionary of Cancer Terms [home, info]
31. Melatonin: Sleep Terms [home, info]
32. melatonin: Medical dictionary [home, info]
33. Melatonin: Drug Medical Dictionary [home, info]

Slang (1 matching dictionary)

34. melatonin: Urban Dictionary [home, info]

Sports (1 matching dictionary)

35. Melatonin: Body Building [home, info]

(Note: See melatonins for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (melatonin) ▸ noun:  hormone secreted by the pineal gland ▸ Also see melatonins ▸ Word origin ▸ Words similar to melatonin ▸ Usage examples for melatonin ▸ Popular adjectives describing melatonin ▸ Words that often appear near melatonin ▸ Rhymes of melatonin ▸ Invented words related to melatonin