donjon

Noun
  1. The main tower within the walls of a medieval castle or fortress (synset 103615311)
    is a type of: fastness, stronghold - a strongly fortified defensive structure
    specific instances: black hole of calcutta - a dungeon (20 feet square) in a fort in Calcutta where as many as 146 English prisoners were held overnight by Siraj-ud-daula; the next morning only 23 were still alive
    is a part of: castle - a large building formerly occupied by a ruler and fortified against attack
    same as: dungeon, keep

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