Baltic (adj.) Look up Baltic at
1580s, "pertaining to the brackish sea between the Scandinavian peninsula and Eastern Europe," from Medieval Latin Balticus, perhaps from Lithuanian baltas "white" or Scandinavian balta "belt; strait" (in reference to its narrow entranceway). In German, it is Ostsee, literally "east sea." From 1887 as the name of a language group comprising Lithuanian, Lettish, and Old Prussian.