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We found 41 dictionaries with English definitions that include the word boo:
Click on the first link on a line below to go directly to a page where "boo" is defined.

General (27 matching dictionaries)

1. boo: Merriam-Webster.com [home, info]
2. boo, boo: Oxford Learner's Dictionaries [home, info]
3. boo, boo: American Heritage Dictionary of the English Language [home, info]
4. boo: Collins English Dictionary [home, info]
5. boo: Vocabulary.com [home, info]
6. boo, boo: Macmillan Dictionary [home, info]
7. Boo, boo: Wordnik [home, info]
8. boo: Cambridge Advanced Learner's Dictionary [home, info]
9. Boo, boo: Wiktionary [home, info]
10. boo: Webster's New World College Dictionary, 4th Ed. [home, info]
11. boo: The Wordsmyth English Dictionary-Thesaurus [home, info]
12. boo: Infoplease Dictionary [home, info]
13. BOO: Dictionary.com [home, info]
14. boo: Online Etymology Dictionary [home, info]
15. boo: UltraLingua English Dictionary [home, info]
16. boo: Cambridge Dictionary of American English [home, info]
17. boo: Cambridge International Dictionary of Idioms [home, info]
18. Boo (Dragon Ball), Boo (Mario), Boo (Nintendo), Boo (character), Boo (dog), Boo (film), Boo (name), Boo (programming language), Boo (rapper), Boo, The Boo (book), The Boo: Wikipedia, the Free Encyclopedia [home, info]
19. boo: Rhymezone [home, info]
20. BOO, Boo, Boo: Stammtisch Beau Fleuve Acronyms [home, info]
21. boo: Free Dictionary [home, info]
22. boo: Mnemonic Dictionary [home, info]
23. boo: WordNet 1.7 Vocabulary Helper [home, info]
24. boo: LookWAYup Translating Dictionary/Thesaurus [home, info]
25. boo: Dictionary/thesaurus [home, info]

Computing (1 matching dictionary)

26. Boo (disambiguation), Boo, Boo: Encyclopedia [home, info]

Medicine (3 matching dictionaries)

27. BOO: Prostate Cancer Interactive Glossary [home, info]
28. BOO, Boo (disambiguation), Boo: Medical dictionary [home, info]
29. BOO: University of Maryland Glossary of Medical Terms [home, info]

Miscellaneous (4 matching dictionaries)

30. BOO: Acronym Finder [home, info]
31. BOO: Three Letter Words with definitions [home, info]
32. BOO: AbbreviationZ [home, info]
33. boo: Idioms [home, info]

Science (1 matching dictionary)

34. BOO: Cytokines & Cells Online Pathfinder Encyclopaedia [home, info]

Slang (4 matching dictionaries)

35. Boo: Totally Unofficial Rap [home, info]
36. boo: Colloquial Speech of Carleton County, New Brunswick, Canada [home, info]
37. Boo: Street Terms: Drugs and the Drug Trade [home, info]
38. Boo, The BOO, boo: Urban Dictionary [home, info]

Tech (1 matching dictionary)

39. BOO: AUTOMOTIVE TERMS [home, info]

(Note: See boos for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (boo) ▸ noun:  a cry or noise made to express displeasure or contempt ▸ verb:  show displeasure, as after a performance or speech ▸ Also see boos ▸ Word origin ▸ Words similar to boo ▸ Usage examples for boo ▸ Idioms related to boo (New!) ▸ Popular adjectives describing boo ▸ Words that often appear near boo ▸ Rhymes of boo ▸ Invented words related to boo