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

 

turnstile

 noun
noun
BrE BrE//ˈtɜːnstaɪl//
 
; NAmE NAmE//ˈtɜːrnstaɪl//
 
 
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a gate at the entrance to a public building, stadium, etc. that turns in a circle when pushed, allowing one person to go through at a timeExtra examples My bag got hooked as I was going through the turnstile. Stewards were checking people’s membership cards at the turnstiles. The club need to attract more supporters through the turnstiles. Fans were already lining up at the turnstiles.
See the Oxford Advanced American Dictionary entry: turnstile