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The Collaborative International Dictionary of English v.0.48 (gcide)

Turret \Tur"ret\, n. [OE. touret, OF. tourette, dim. of tour a
tower, L. turris. See {Tower}.]
[1913 Webster]
1. (Arch.) A little tower, frequently a merely ornamental
structure at one of the angles of a larger structure.
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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.
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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.
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4. (Railroads) The elevated central portion of the roof of a
passenger car. Its sides are pierced for light and
ventilation.
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{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.
[1913 Webster]


Turrethead \Tur"ret*head\
an attachment fitted to a lathe or other machinery which
holds a variety of tools which can act on the object being
worked, and which are interchangeable by a pivoting motion,
thus allowing efficient performance of multiple operations;
-- also called a {turret}.
[PJC]