TURNSTILE

turnstile. Turnstile, n. a kind of turning or whirling stile

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Turn″stile′ (?), n. 1. 1. A revolving frame in a footpath, preventing the passage of horses or cattle, but admitting that of persons; a turnpike. See Turnpike, n., 1.
2. 2. A similar arrangement for registering the number of persons passing through a gateway, doorway, or the like.