fellatio.
Performance of oral sex upon the penis.
Meaning & usage
Performance of oral sex upon the penis.
Where this word comes from
Etymology tree Proto-Indo-European *dʰeh₁(y)- Latin fellō Proto-Indo-European *-tis Proto-Indo-European *-Hō Proto-Indo-European *-tiHō Proto-Italic *-tiō Latin -tiō Latin fellātiōlbor. English fellatio Learned borrowing from Latin fellātiō, from fellātus, perfect participle of fellō (“to suck, to fellate”). The word started to appear in medical literature in the 19th century but it was still treated as Latin. In 1919, the California Supreme Court struck down a law criminalizing fellatio because the state constitution required laws to be written in English. By the late 20th century, fellatio was treated as an English word.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.