fauces Syllabification: (fau·ces)Pronunciation: /ˈfōˌsēz/Definition of fauces noun Anatomy the arched opening at the back of the mouth leading to the pharynx. Derivatives faucialPronunciation: /ˈfôSHəl/ adjective Origin: late Middle English: from Latin, 'throat'fauces in other Oxford dictionaries Definition of fauces in the British & World English dictionary