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We found 58 dictionaries with English definitions that include the word brain:
Click on the first link on a line below to go directly to a page where "brain" is defined.

General (35 matching dictionaries)

1. brain: Merriam-Webster.com [home, info]
2. brain: Oxford Learner's Dictionaries [home, info]
3. brain: American Heritage Dictionary of the English Language [home, info]
4. brain: Collins English Dictionary [home, info]
5. brain: Vocabulary.com [home, info]
6. brain, brain: Macmillan Dictionary [home, info]
7. Brain, brain: Wordnik [home, info]
8. brain: Cambridge Advanced Learner's Dictionary [home, info]
9. Brain, Brain, Brain, Brain, Brain: InfoVisual Visual Dictionary [home, info]
10. Brain, brain: Wiktionary [home, info]
11. brain: Webster's New World College Dictionary, 4th Ed. [home, info]
12. brain: The Wordsmyth English Dictionary-Thesaurus [home, info]
13. brain: Infoplease Dictionary [home, info]
14. brain: Dictionary.com [home, info]
15. brain: Online Etymology Dictionary [home, info]
16. brain: UltraLingua English Dictionary [home, info]
17. brain: Cambridge Dictionary of American English [home, info]
18. brain: Cambridge International Dictionary of Idioms [home, info]
19. (c)Brain, Brain (Hiromi Album), Brain (Inspector Gadget), Brain (TV series), Brain (Top Cat character), Brain (album), Brain (as food), Brain (comics), Brain (computer virus), Brain (disambiguation), Brain (food), Brain (journal), Brain (novel), Brain (surname), Brain, The Brain (club), The Brain (film), The Brain (game show), The Brain, The brain: Wikipedia, the Free Encyclopedia [home, info]
20. Brain: Online Plain Text English Dictionary [home, info]
21. brain: Webster's Revised Unabridged, 1913 Edition [home, info]
22. brain: Rhymezone [home, info]
23. brain: AllWords.com Multi-Lingual Dictionary [home, info]
24. brain: Webster's 1828 Dictionary [home, info]
25. Brain: Encarta® Online Encyclopedia, North American Edition [home, info]
26. Brain: 1911 edition of the Encyclopedia Britannica [home, info]
27. brain: Free Dictionary [home, info]
28. brain: The Phrontistery - A Dictionary of Obscure Words [home, info]
29. brain: Mnemonic Dictionary [home, info]
30. brain: WordNet 1.7 Vocabulary Helper [home, info]
31. Brain, brain: LookWAYup Translating Dictionary/Thesaurus [home, info]
32. brain: Dictionary/thesaurus [home, info]
33. brain: Wikimedia Commons US English Pronunciations [home, info]

Business (1 matching dictionary)

34. The Brain, brain: Legal dictionary [home, info]

Computing (1 matching dictionary)

35. The Brain, brain: Encyclopedia [home, info]

Medicine (12 matching dictionaries)

36. Brain: MedTerms.com Medical Dictionary [home, info]
37. Brain: Medical Dictionary [home, info]
38. Brain: Merck Manuals [home, info]
39. BRAIN: Probert Encyclopaedia of Medicine [home, info]
40. Brain: Gray's Anatomy (1918) [home, info]
41. brain: Multiple Sclerosis Encyclopaedia [home, info]
42. brain: Neurotrauma Glossary [home, info]
43. The Brain, brain: Medical dictionary [home, info]
44. Brain: Drug Medical Dictionary [home, info]
45. brain: Hyperdictionary [home, info]
46. Brain: Anatomy of the Human Body [home, info]
47. brain: online medical dictionary [home, info]

Miscellaneous (4 matching dictionaries)

48. Brain: Brilliant Dream Dictionary [home, info]
49. BRAIN: Acronym Finder [home, info]
50. BRAIN: AbbreviationZ [home, info]
51. brain: Idioms [home, info]

Science (1 matching dictionary)

52. brain: Natural History Terms [home, info]

Slang (3 matching dictionaries)

53. brain: English slang and colloquialisms used in the United Kingdom [home, info]
54. Brain: Totally Unofficial Rap [home, info]
55. brain(s): Urban Dictionary [home, info]

Sports (1 matching dictionary)

56. brain: Mountain Bike Slang [home, info]

(Note: See brains for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (brain) ▸ noun:  that part of the central nervous system that includes all the higher nervous centers; enclosed within the skull; continuous with the spinal cord ▸ noun:  mental ability ("He's got plenty of brains but no common sense") ▸ noun:  the brain of certain animals used as meat ▸ noun:  that which is responsible for one's thoughts and feelings; the seat of the faculty of reason ▸ noun:  someone who has exceptional intellectual ability and originality ▸ verb:  kill by smashing someone's skull ▸ verb:  hit on the head ▸ name:  A male given name (rare: 1 in 7692 males; popularity rank in the U.S.: #602) ▸ name:  A surname (common: 1 in 100000 families; popularity rank in the U.S.: #18792) ▸ Also see brains ▸ Word origin ▸ Words similar to brain ▸ Usage examples for brain ▸ Idioms related to brain (New!) ▸ Popular adjectives describing brain ▸ Words that often appear near brain ▸ Rhymes of brain ▸ Invented words related to brain