Tur·ret n.
 1. Arch. A little tower, frequently a merely ornamental structure at one of the angles of a larger structure.
 2. Anc. Mil. A movable building, of a square form, consisting of ten or even twenty stories and sometimes one hundred and twenty cubits high, usually moved on wheels, and employed in approaching a fortified place, for carrying soldiers, engines, ladders, casting bridges, and other necessaries.
 3. Mil. A revolving tower constructed of thick iron plates, within which cannon are mounted. Turrets are used on vessels of war and on land.
 4. Railroads The elevated central portion of the roof of a passenger car. Its sides are pierced for light and ventilation.
 Turret clock, a large clock adapted for an elevated position, as in the tower of a church.
 Turret head Mach., a vertical cylindrical revolving tool holder for bringing different tools into action successively in a machine, as in a lathe.
 Turret lathe, a turning lathe having a turret head.
 Turret ship, an ironclad war vessel, with low sides, on which heavy guns are mounted within one or more iron turrets, which may be rotated, so that the guns may be made to bear in any required direction.

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 turret clock
      n : a clock with more than one dial to show the time in all
          directions from a tower