Bible Encyclopedias
Dungeon

1911 Encyclopedia Britannica

the prison in a castle keep, so called because the Norman name for the latter is donjon, and the dungeons or prisons are generally in its lowest storey. (See KEEP.)

Bibliography Information
Chisholm, Hugh, General Editor. Entry for 'Dungeon'. 1911 Encyclopedia Britanica. https://www.studylight.org/​encyclopedias/​eng/​bri/​d/dungeon.html. 1910.