Definitions
1.nounA frame consisting of two bars crossing each other at right angles and turning on a post or pin, to hinder the passage of animals, but admitting a person to pass between the arms; a turnstile.
2.nounA gate or bar set across a road to stop carriages, animals, and sometimes people, until a toll is paid,
3.nounA winding stairway.
4.nounA beam filled with spikes to obstruct passage; a cheval de frise.
5.nounA toll road, especially a toll expressway.
6.noun(mathematical economics) A trajectory on a finite time interval that satisfies an optimality criterion which is associated with a cost function.
7.verbTo form (a road, etc.) in the manner of a turnpike road; into a rounded form, as the path of a road.