meaning of turnstile
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. A similar arrangement for registering the number of persons passing through a gateway, doorway, or the like.
3. a gate consisting of a post that acts as a pivot for rotating arms; set in a passageway for controlling the persons entering