We found 30 dictionaries that define the word fellatio:

General (21 matching dictionaries)

1. fellatio: Merriam-Webster
2. fellatio: Oxford Learner's Dictionaries
3. fellatio: American Heritage Dictionary of the English Language
4. fellatio: Collins English Dictionary
5. fellatio: Vocabulary.com
6. fellatio: Wordnik
7. fellatio: Cambridge Advanced Learner's Dictionary
8. fellatio: Wiktionary
9. fellatio: Webster's New World College Dictionary, 4th Ed.
10. fellatio: The Wordsmyth English Dictionary-Thesaurus
11. fellatio: Infoplease Dictionary
12. fellatio: Dictionary.com
13. fellatio: Online Etymology Dictionary
14. Fellatio (disambiguation), Fellatio: Wikipedia, the Free Encyclopedia
15. fellatio: Rhymezone
16. fellatio: FreeDictionary.org
17. fellatio: Mnemonic Dictionary
18. fellatio: TheFreeDictionary.com
19. fellatio: Longman Dictionary of Contemporary English

Business (1 matching dictionary)

20. Fellatio: Legal dictionary

Medicine (6 matching dictionaries)

21. fellatio: Merriam-Webster Medical Dictionary
22. Dorland's Illustrated Medical Dictionary (No longer online)
23. Fellatio: MedFriendly Glossary
24. online medical dictionary (No longer online)
25. Glossary of HIV/AIDS Related Terms (No longer online)
26. fellatio: Medical dictionary

Miscellaneous (2 matching dictionaries)

27. Brilliant Dream Dictionary (No longer online)
28. Glossary of Unusual Sexual Practices (No longer online)

(Note: See fellatios as well.)

Definitions from Wiktionary ( ) ▸ noun:  The stimulation of the penis using the mouth. Similar: fellation, oral sex, cunnilingus, dicksucking, facefuck, head, blow job, anilingus, cocksucking, tonguefuck, more... Opposite: cunnilingus Phrases: Fellatio in Halacha, Machine Gun Fellatio, more... Adjectives: mutual, heterosexual, passive, active, simulated, unprotected, more, male, receptive, simultaneous, ritualized ▸ Word origin ▸ Words similar to fellatio ▸ Usage examples for fellatio ▸ Idioms related to fellatio ▸ Wikipedia articles (New!) ▸ Popular adjectives describing fellatio ▸ Words that often appear near fellatio ▸ Rhymes of fellatio ▸ Invented words related to fellatio