noun
fellatio
fuh-LAY-shee-oh
noun
1
Oral sex performed on a penis.
"The book discussed fellatio in clinical, non-explicit terms."
How to Use Fellatio
Learner’s notesIn plain EnglishA clinical, Latin-derived term rather than a slang one.
When to use it
Formal/clinical register; used in medical, legal, or academic contexts rather than casual speech.
Word Forms
fellatios plural
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Etymology
A learned 19th-century borrowing from Latin fellatio, from fello ("to suck"). It first showed up in medical writing, and a 1919 California Supreme Court ruling actually struck down an anti-fellatio law because the state constitution required statutes to be written in English — fellatio was still considered Latin at the time.