faucesPronunciation: /ˈfɔːsiːz/Definition of fauces noun Anatomy the arched opening at the back of the mouth leading to the pharynx. Derivatives faucialPronunciation: /ˈfɔːʃ(ə)l/ adjective Origin: late Middle English: from Latin, 'throat'fauces in other Oxford dictionaries Definition of fauces in the US English dictionary