a former province of NE Germany on the Baltic Sea: separated in 1919 from the rest of Germany by the Polish Corridor and Danzig: in 1945 Poland received the south part, the Soviet Union the north
German name: Ostpreussen (ostˈprɔysən)
East Prussia in American English
former province of Prussia, in NE Germany, on the Baltic Sea, separated from the rest of Germany (1919-39) bythe Polish Corridor: in 1945, it was divided between Poland and the U.S.S.R.