fellatio

noun
🔊/fəˈleɪʃiəʊ/
🔊/fəˈleɪʃiəʊ/
[uncountable] (formal)
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  1. the practice of touching a man’s penis with the tongue and lips to give sexual pleasure吮吸阴茎;口交
    Word Originlate 19th cent.: modern Latin, from Latin fellare ‘to suck’.