D defs.my
Entry 2 senses Webster, 1913

Turnstile

/tẽrn'-stīlˌ/ · Turn·stile · IPA /ˈtɝnstaɪl/
01 n. A revolving frame in a footpath, preventing the passage of horses or cattle, but admitting that of persons; a turnpike. See Turnpike, n., 1.
  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. See: Turnpike
  2. 2.
    A similar arrangement for registering the number of persons passing through a gateway, doorway, or the like.