We found 54 dictionaries that define the word who:

General (29 matching dictionaries)

1. who: Longman Dictionary of Contemporary English
2. WHO, who: Merriam-Webster
3. WHO, WHO, Who, who, the Who: Oxford Learner's Dictionaries
4. WHO, who: American Heritage Dictionary of the English Language
5. who: Collins English Dictionary
6. WHO, who: Vocabulary.com
7. WHo, Who, Who, Who, who, who, who, who, the-who: Wordnik
8. who, the WHO, the who: Cambridge Advanced Learner's Dictionary
9. W.H.O, WHO, Who, who: Wiktionary
10. who: Webster's New World College Dictionary, 4th Ed.
11. WHO, who: The Wordsmyth English Dictionary-Thesaurus
12. who: Infoplease Dictionary
13. WHO: Dictionary.com
14. who: Online Etymology Dictionary
15. who: Cambridge Essential American English Dictionary
16. The Who (band), The Who, The who, W.H.O, WHO (AM), WHO (disambiguation), WHO, Who (Lauv song), Who (Unix), Who (album), Who (disambiguation), Who (film), Who (magazine), Who (pronoun), Who: Wikipedia, the Free Encyclopedia
17. Who: Online Plain Text English Dictionary
18. who: Webster's Revised Unabridged, 1913 Edition
19. Who: Rhymezone
20. who: AllWords.com Multi-Lingual Dictionary
21. who: Webster's 1828 Dictionary
22. WHO: Stammtisch Beau Fleuve Acronyms
23. who: FreeDictionary.org
24. who: Mnemonic Dictionary
25. WHO: TheFreeDictionary.com
26. who: Wikimedia Commons US English Pronunciations
27. Who: Wordnik

Art (1 matching dictionary)

28. Glossary of Stamp Collecting Terms (No longer online)

Business (4 matching dictionaries)

29. Travel Industry Dictionary (No longer online)
30. Construction Term Glossary (No longer online)
31. eyefortransport e-commerce transportation glossary (No longer online)
32. Glossary of Trade and Shipping Terms (No longer online)

Computing (1 matching dictionary)

33. WHO (disambiguation), WHO, Who: Encyclopedia

Medicine (10 matching dictionaries)

34. WHO: Merriam-Webster Medical Dictionary
35. Dorland's Illustrated Medical Dictionary (No longer online)
36. WHO (World Health Organization): MedTerms.com Medical Dictionary
37. AIDSinfo Glossary (No longer online)
38. who: Sound Alike Words
39. online medical dictionary (No longer online)
40. Hepatitis C Information Central (No longer online)
41. WHO: Dictionary of Cancer Terms
42. WHO (disambiguation), WHO, Who: Medical dictionary
43. WHO (World Health Organization): Drug Medical Dictionary

Miscellaneous (5 matching dictionaries)

44. CIA World Factbook (No longer online)
45. WHO: Acronym Finder
46. WHO: Three Letter Words with definitions
47. AbbreviationZ (No longer online)
48. who: Idioms

Science (1 matching dictionary)

49. Glossary of chlorine and other chemical related terms (No longer online)

Slang (1 matching dictionary)

50. W.H.O, who: Urban Dictionary

Tech (2 matching dictionaries)

51. DOD Dictionary of Military Terms: Joint Acronyms and Abbreviations (No longer online)
52. Glossary of Agricultural Terms, Programs and Laws (No longer online)

(Note: See whos as well.)

Definitions from Wiktionary ( ) ▸ noun:  A person under discussion; a question of which person. ▸ noun:  (fandom slang) The television show Doctor Who. ▸ noun:  Initialism of World Health Organization. [An agency of the United Nations responsible for international public health] Similar: anybody who is anybody, anybody who is anyone, anyone who is anybody, anyone who is anyone, everybody who is anybody, everybody who is anyone, everyone who is anybody, everyone who is anyone, raise the flag and see who salutes, send it up the flagpole and see who salutes, more... Opposite: what, where, when, why, how Phrases: man who, who knows, Who Knew, who the, who says, more... Colors:     white,     black,     blue,     red,     green, more... ▸ Word origin ▸ Words similar to who ▸ Usage examples for who ▸ Idioms related to who ▸ Wikipedia articles (New!) ▸ Popular adjectives describing who ▸ Words that often appear near who ▸ Rhymes of who ▸ Invented words related to who