THORAX Meaning of THORAX in English thorax BrE AmE ˈθɔːr æks ˈθoʊr- ▷ thoraces ˈθɔːr ə siːz θɔː ˈreɪs iːz ˈθoʊr- ▷ thorax|es ɪz əz Longman Pronunciation English Dictionary. Английский словарь произношений Longman. 2012