Noun dungeon has 2 senses
  1. keep, donjon, dungeon - the main tower within the walls of a medieval castle or fortress
    --1 is a kind of stronghold, fastness
    --1 is a part of castle
    --1 has particulars: Black Hole of Calcutta
  2. dungeon - a dark cell (usually underground) where prisoners can be confined
    --2 is a kind of
    cell, jail cell, prison cell
    --2 has particulars: oubliette
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