Definition of dungeon noun from the Oxford Advanced Learner's Dictionary

 

dungeon

 noun
noun
BrE BrE//ˈdʌndʒən//
 
; NAmE NAmE//ˈdʌndʒən//
 
Historic buildings
 
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a dark underground room used as a prison, especially in a castle Throw him into the dungeons! See related entries: Historic buildings Word 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’.
See the Oxford Advanced American Dictionary entry: dungeon