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

 

moat

 noun
noun
BrE BrE//məʊt//
 
; NAmE NAmE//moʊt//
 
Historic buildings, Rivers and lakes, Architectural features
 
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a deep wide channel that was dug around a castle, etc. and filled with water to make it more difficult for enemies to attack The castle was ringed by a moat spanned by a wooden drawbridge. See related entries: Historic buildings, Rivers and lakes, Architectural features Word Origin late Middle English: from Old French mote ‘mound’.
See the Oxford Advanced American Dictionary entry: moat