Schleswig-HolsteinPronunciation: /ˈhɒlstʌɪn, ˈhɔlʃtaɪn/Definition of Schleswig-Holstein a state of NW Germany, occupying the southern part of the Jutland peninsula; capital, Kiel. It comprises the former duchies of Schleswig and Holstein. Schleswig-Holstein in other Oxford dictionaries Definition of Schleswig-Holstein in the US English dictionary