a sea in N Europe, connected with the North Sea by the Skagerrak, Kattegat, and Öresund; shallow, with low salinity and small tides
Baltic Sea in American English
sea in N Europe, south & east of the Scandinavian Peninsula, west of the Baltic States, & north of Poland, connecting with the North Sea through the Kattegat & Skagerrak: 147,500 sq mi (382,024 sq km)