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

 

banister

 noun
(also bannister)noun
BrE BrE//ˈbænɪstə(r)//
 
; NAmE NAmE//ˈbænɪstər//
 
(British English also banisters [plural])
 
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the posts and rail which you can hold for support when going up or down stairs to hold on to the banister/banisters The kids were sliding down the banisters. Word Origin mid 17th cent.: from earlier barrister, alteration of baluster.
See the Oxford Advanced American Dictionary entry: banister