dungeon
noun
[ ˈdʌn(d)ʒ(ə)n ]
• a strong underground prison cell, especially in a castle.
Similar:
underground cell,
underground prison,
oubliette,
cell,
prison,
jail,
lock-up,
black hole,
hole,
thieves' hole,
bocardo,
• archaic term for donjon.
dungeon
verb
• imprison (someone) in a dungeon.
Origin:
Middle English (also with the sense ‘castle keep’): from Old French (perhaps originally with the sense ‘lord's tower’ or ‘mistress tower’), based on Latin dominus ‘lord, master’. Compare with donjon.