1. A dark cell (usually underground) where prisoners can be confined
   "The castle tour included a visit to the medieval dungeon"
    
2. [archaic] The main tower within the walls of a medieval castle or fortress
   "The castle's dungeon provided the best defensive position";
   - keep, donjon

Derived forms: dungeons

Type of: cell, fastness, jail cell, peter [Austral, NZ, informal], prison cell, stronghold

Part of: castle

Encyclopedia: Dungeon