English

Definition of spiral staircase noun from the Oxford Advanced Learner's Dictionary

 

spiral staircase

 noun
noun
BrE BrE//ˌspaɪrəl ˈsteəkeɪs//
 
; NAmE NAmE//ˌspaɪrəl ˈsterkeɪs//
 
 
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a set of stairs that curve upwards around a central post
See the Oxford Advanced American Dictionary entry: spiral staircase