fellationoun [ U ]
uk/fəˈleɪ.ʃi.əʊ/us/fəˈleɪ.ʃi.oʊ/the sexual activity of sucking or moving the tongue across the penis in order to give pleasure and excitement
Compare
cunnilingus
fellate
verb [ T ] uk/felˈeɪt/us/ˈfel.eɪt/
to perform fellatio on a man