Dachau Syllabification: (Da·chau)Pronunciation: /ˈdäˌKHou/Definition of Dachau a city in Bavaria in southwestern Germany, on the Amper River, near Munich, site of a Nazi concentration camp from 1933 until 1945; population 41,200 (est. 2007). Dachau in other Oxford dictionaries Definition of Dachau in the British & World English dictionary