fellatio

[fuh-ley-shee-oh, -lah-tee-oh, fe-] /fəˈleɪ ʃiˌoʊ, -ˈlɑ tiˌoʊ, fɛ-/
noun
1.
oral stimulation of the penis, especially to orgasm.
Also, fellation
[fuh-ley-shuh n, fe-] /fəˈleɪ ʃən, fɛ-/ (Show IPA).
Origin
1885-90; < Neo-Latin fellātiō, equivalent to Latin fel(l)āt(us) (past participle of fel(l)āre to suck) + -iō -ion
British Dictionary definitions for fellatio

fellatio

/fɪˈleɪʃɪəʊ; fɛ-/
noun
1.
a sexual activity in which the penis is stimulated by the partner's mouth Compare cunnilingus
Derived Forms
fellator, noun
fellatrix, noun:feminine
Word Origin
C19: New Latin, from Latin fellāre to suck
Word Origin and History for fellatio
n.

1887, from Latin fellatus, past participle of fellare "to suck," from PIE root *dhe(i)- (see fecund). The sexual partner performing fellatio is a fellator; if female, a fellatrice or fellatrix.

fellatio in Medicine

fellatio fel·la·ti·o (fə-lā'shē-ō', fě-)
n.
Oral stimulation of the penis.