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

 

battlements

 noun
noun
BrE BrE//ˈbætlmənts//
 
; NAmE NAmE//ˈbætlmənts//
 
[plural]
 
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a low wall around the top of a castle with spaces in it that people inside could shoot through Word Origin late Middle English: from Old French bataillier ‘fortify with movable defence turrets’, possibly related to battle + -ment.
See the Oxford Advanced American Dictionary entry: battlements