Definify.com
Webster 1913 Edition
Turnstile
Turn′stileˊ
,Noun.
1.
A revolving frame in a footpath, preventing the passage of horses or cattle, but admitting that of persons; a turnpike. See , 1.
Turnpike
, Noun.
2.
A similar arrangement for registering the number of persons passing through a gateway, doorway, or the like.
Webster 1828 Edition
Turnstile
TURN'STILE
,Noun.