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



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 OriginMiddle 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