Source : Webster's Revised Unabridged Dictionary (1913)

Turnpike \Turn"pike`\, n. [Turn + pike.]
   1. A frame consisting of two bars crossing each other at
      right angles and turning on a post or pin, to hinder the
      passage of beasts, but admitting a person to pass between
      the arms; a turnstile. See {Turnstile}, 1.

            I move upon my axle like a turnpike.  --B. Jonson.

   2. A gate or bar set across a road to stop carriages,
      animals, and sometimes people, till toll is paid for
      keeping the road in repair; a tollgate.

   3. A turnpike road. --De Foe.

   4. A winding stairway. [Scot.] --Sir W. Scott.

   5. (Mil.) A beam filled with spikes to obstruct passage; a
      cheval-de-frise. [R.]

   {Turnpike man}, a man who collects tolls at a turnpike.

   {Turnpike road}, a road on which turnpikes, or tollgates, are
      established by law, in order to collect from the users
      tolls to defray the cost of building, repairing, etc.