We found 34 dictionaries that define the word masturbation:

General (23 matching dictionaries)

1. masturbation: Merriam-Webster
2. masturbation: Oxford Learner's Dictionaries
3. masturbation: American Heritage Dictionary of the English Language
4. masturbation: Collins English Dictionary
5. masturbation: Vocabulary.com
6. Masturbation, masturbation: Wordnik
7. masturbation: Cambridge Advanced Learner's Dictionary
8. masturbation: Wiktionary
9. masturbation: The Wordsmyth English Dictionary-Thesaurus
10. masturbation: Infoplease Dictionary
11. masturbation: Dictionary.com
12. masturbation: Online Etymology Dictionary
13. masturbation: Cambridge Essential American English Dictionary
14. Masturbation: Wikipedia, the Free Encyclopedia
15. Masturbation: Online Plain Text English Dictionary
16. masturbation: Webster's Revised Unabridged, 1913 Edition
17. masturbation: Rhymezone
18. Masturbation: AllWords.com Multi-Lingual Dictionary
19. masturbation: FreeDictionary.org
20. masturbation: Mnemonic Dictionary
21. masturbation: TheFreeDictionary.com

Computing (1 matching dictionary)

22. masturbation: Encyclopedia

Medicine (7 matching dictionaries)

23. masturbation: Merriam-Webster Medical Dictionary
24. Dorland's Illustrated Medical Dictionary (No longer online)
25. Medical Dictionary (No longer online)
26. Masturbation: Merck Manuals
27. Masturbation: MedFriendly Glossary
28. online medical dictionary (No longer online)
29. masturbation: Medical dictionary

Miscellaneous (2 matching dictionaries)

30. Brilliant Dream Dictionary (No longer online)
31. Glossary of Unusual Sexual Practices (No longer online)

Slang (1 matching dictionary)

32. masturbation: Urban Dictionary

(Note: See masturbations as well.)

Definitions from Wiktionary (masturbation) ▸ noun:  Sexual stimulation of the genitals or other erotic regions, often to orgasm, usually of oneself. ▸ noun:  (figurative) A vain activity. Similar: onanism, self-abuse, masturbator, masturbationism, mutual masturbation, ménage à moi, mastupration, milking, musterbation, massage, more... Opposite: coitus, intercourse, sex Phrases: mutual masturbation, Anal masturbation, Religious views on masturbation, History of masturbation, National Masturbation Day, more... Adjectives: mutual, excessive, female, compulsive, infantile, male, solitary, public, frequent, mental, anal Colors:     pink,     red,     purple,     blue,     black, more... ▸ Word origin ▸ Words similar to masturbation ▸ Usage examples for masturbation ▸ Idioms related to masturbation ▸ Wikipedia articles (New!) ▸ Popular adjectives describing masturbation ▸ Words that often appear near masturbation ▸ Rhymes of masturbation ▸ Invented words related to masturbation