the posts and rail that you can hold for support when going up or down stairs (楼梯的)栏杆,扶手 to hold on to the banister/banisters 紧抓住扶手 The kids were sliding down the banisters. 孩子们正从楼梯扶手上滑下来。
Oxford Collocations DictionaryBanister is used before these nouns:- rail
Word Originmid 17th cent.: from earlier barrister, alteration of baluster.