Definition of staircase noun from the Oxford Advanced American Dictionary

 

staircase

 noun
noun
NAmE//ˈstɛrkeɪs//
 
 
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a set of stairs including the posts and rails (= banisters ) that are fixed at the side a marble/stone/wooden staircase see also spiral staircase
See the Oxford Advanced Learner's Dictionary entry: staircase

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