turret

[tur-it, tuhr-]
noun
1.
a small tower, usually one forming part of a larger structure.
2.
a small tower at an angle of a building, as of a castle or fortress, frequently beginning some distance above the ground.
3.
Also called turrethead [tur-it-hed, tuhr-] . a pivoted attachment on a lathe or the like for holding a number of tools, each of which can be presented to the work in rapid succession by a simple rotating movement.
4.
Military. a domelike, sometimes heavily armored structure, usually revolving horizontally, within which guns are mounted, as on a fortification, ship, or aircraft.
5.
Fortification. a tall structure, usually moved on wheels, formerly employed in breaching or scaling a fortified place, a wall, or the like.

Origin:
1300–50; Middle English turet < Middle French turete, equivalent to tur tower + -ete -et

turretless, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
turret (ˈtʌrɪt)
 
n
1.  a small tower that projects from the wall of a building, esp a medieval castle
2.  a.  a self-contained structure, capable of rotation, in which weapons are mounted, esp in tanks and warships
 b.  a similar structure on an aircraft that houses one or more guns and sometimes a gunner
3.  a tall wooden tower on wheels used formerly by besiegers to scale the walls of a fortress
4.  (on a machine tool) a turret-like steel structure with tools projecting radially that can be indexed round to select or to bring each tool to bear on the work
 
[C14: from Old French torete, from tor tower, from Latin turris]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

turret
c.1300, "small tower," from O.Fr. touret (12c.), dim. of tour "tower," from L. turris (see tower). Meaning "low, flat gun-tower on a warship" is recorded from 1862, later also of tanks.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
One corner of the tower is sliced away to reveal a cylindrical core of shingled
  zinc that evokes the image of a turret or silo.
The master bedroom is in the house's turret and has a working fireplace.
Last summer scientists and divers raised the ship's gun turret to the surface.
She will have no masts, no bulwarks, no structure of any kind on deck except
  the turret.
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