We found 26 dictionaries that define the word buttocks:

General (16 matching dictionaries)

1. buttocks: Merriam-Webster
2. buttocks: Oxford Learner's Dictionaries
3. buttocks: Collins English Dictionary
4. buttocks: Vocabulary.com
5. buttocks: Wordnik
6. buttocks: Cambridge Advanced Learner's Dictionary
7. buttocks: Wiktionary
8. buttocks: Dictionary.com
9. buttocks: Online Etymology Dictionary
10. buttocks: Cambridge Essential American English Dictionary
11. Buttocks: Wikipedia, the Free Encyclopedia
12. buttocks: Rhymezone
13. buttocks: AllWords.com Multi-Lingual Dictionary
14. buttocks: FreeDictionary.org
15. buttocks: Mnemonic Dictionary
16. buttocks: TheFreeDictionary.com

Computing (1 matching dictionary)

17. buttocks: Encyclopedia

Medicine (5 matching dictionaries)

18. buttocks: Merriam-Webster Medical Dictionary
19. Dorland's Illustrated Medical Dictionary (No longer online)
20. online medical dictionary (No longer online)
21. Hair Facts (No longer online)
22. buttocks: Medical dictionary

Miscellaneous (1 matching dictionary)

23. buttocks: Idioms

Slang (2 matching dictionaries)

24. buttocks: Green’s Dictionary of Slang
25. buttocks: Urban Dictionary

Tech (1 matching dictionary)

26. SeaTalk Dictionary of English Nautical Language (No longer online)

(Note: See buttock as well.)

Definitions from Wikipedia (Buttocks) ▸ noun:  The buttocks (: buttock) are two rounded portions of the exterior anatomy of most mammals, located on the posterior of the pelvic region. Types: gluteus maximus, gluteus medius, gluteus minimus, gluteus externus, more... Phrases: cross buttocks, Cultural history of the buttocks, big buttocks, bottom or buttocks, more... Adjectives: bare, naked, firm, rounded, large, white, small, tight, fat, big, little Colors:     peach,     beige,     tan,     nude,     blush, more... ▸ Word origin ▸ Words similar to buttocks ▸ Usage examples for buttocks ▸ Idioms related to buttocks ▸ Wikipedia articles (New!) ▸ Popular adjectives describing buttocks ▸ Words that often appear near buttocks ▸ Rhymes of buttocks ▸ Invented words related to buttocks