bergfried means A tall defensive tower typically found in medieval castles in German-influenced countries. Lexicurio rates it Sui generis — a strength score of 89 out of 100.
noun
- A tall defensive tower typically found in medieval castles in German-influenced countries.“Founded in 1100, and boasting a bergfried (free-standing defensive tower), turreted ramparts, and Gothic additions, it's the only medieval castle on the Rhine never to have been destroyed.”