Mülheim Syllabification: (Mül·heim)Pronunciation: /ˈmyo͞olˌhīm, ˈmYl-/Definition of Mülheim an industrial city in western Germany, in North Rhine-Westphalia, southwest of Essen; population 169,400 (est. 2006). Full name Mülheim an der Ruhr. Mülheim in other Oxford dictionaries Definition of Mülheim in the British & World English dictionary