Hypertext Webster Gateway: "turnstile"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Turnstile \Turn"stile`\, n.
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.
From WordNet (r) 1.7 (wn)
turnstile
n : a gate consisting of a post that acts as a pivot for
rotating arms; set in a passageway for controlling the
persons entering
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