turn-stile

turnstile

[turn-stahyl]
noun
1.
a structure of four horizontally revolving arms pivoted atop a post and set in a gateway or opening in a fence to allow the controlled passage of people.
2.
a similar device set up in an entrance to bar passage until a charge is paid, to record the number of persons passing through, etc.

Origin:
1635–45; turn + stile1

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Collins
World English Dictionary
turnstile (ˈtɜːnˌstaɪl)
 
n
1.  a mechanical gate or barrier with metal arms that are turned to admit one person at a time, usually in one direction only
2.  any similar device that admits foot passengers but no large animals or vehicles
3.  logic Also called: gatepost a symbol of the form ̃⊢, ⊨, or ⊩, used to represent logical consequence when inserted between expressions to form a sequent, or when prefixed to a single expression to indicate its status as a theorem

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

turnstile
1643, from turn + stile.
Online Etymology Dictionary, © 2010 Douglas Harper
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