• WordNet 3.6
    • n turntable a circular horizontal platform that rotates a phonograph record while it is being played
    • n turntable a rotatable platform with a track; used to turn locomotives and cars
    • n turntable a revolving tray placed on a dining table
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Webster's Revised Unabridged Dictionary
    • n Turntable A large revolving platform, for turning railroad cars, locomotives, etc., in a different direction; -- called also turnplate.
    • ***
Century Dictionary and Cyclopedia
    • n turntable A circular platform designed to turn upon its center, and supported by a series of wheels that travel upon a circular track laid under the edge of the platform. This is the original form of the railroad turn-table, and is still in use. The platform is laid with a single line of rails, and the running-gear, pivot, wheels, etc., are sunk in a circular pit. so that the track is level with the connecting tracks. In some cases a second line of rails is laid on the platform, at right angles with the first. The turn-table for turning locomotives, as at the end of local lines, is now usually simply a wooden or iron girder, pivoted at the center and having each end supported on wheels that move on a circular track in a pit, the platform being dispensed with. Small turn-tables for moving cars from one track to another, as in narrow yards where there is no room for curves or switches, are sometimes used. Also called turning-plate.
    • n turntable A device used in tracing the circular cementcells for microscope-slides.
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In literature:

Accordingly turntable sheds have been adopted.
"Aeroplanes and Dirigibles of War" by Frederick A. Talbot
I have posed on the turntable in variety-shows.
"When We Dead Awaken" by Henrik Ibsen
They consist of off-railers, crossings, turntables, etc.
"Scientific American Supplement, No. 446, July 19, 1884" by Various
It requires, therefore, either a turntable or a triangle at the end of the line, so as to enable it to reverse its direction.
"Scientific American Supplement, No. 530, February 27, 1886" by Various
Shoes or skids are then placed upon the track, and the wheels of the turntable are run up on them.
"Scientific American Supplement, No. 484, April 11, 1885" by Various
It was dusk when the purse seiner finished loading her catch and stowed the great net in a dripping heap on the turntable aft.
"Poor Man's Rock" by Bertrand W. Sinclair
In placing engine on the turntable, at water or stand pipes, or at other similar places, what must be done?
"The Traveling Engineers' Association" by Anonymous
The second car carries the platform and turntable on which the gun is mounted, and the third hauls the barrel, or gun proper.
"Kelly Miller's History of the World War for Human Rights" by Kelly Miller
Ralph, half-across the turntable, halted and went over to No.
"Ralph on the Overland Express" by Allen Chapman
Boys playing on the turntables and getting crippled for life, one by one!
"Sure Pop and the Safety Scouts" by Roy Rutherford Bailey

In news:

Turntable makes dry spot for pot.
MK Products has introduced the new CobraTurn™ digital turntable.
What's with the huge turntable.
Turntable.FM Signs Licensing Deals With All Four Major Labels.
's New Mix: Digital Files and a Turntable.
But when I can sneak in a few minutes, I love spending it on turntable.fm.
And a Turntable with the Cosmic Cowboy.
High-end audio retailer Audio Turntable has begun marketing ELP's Laser Turntable in the United States.
Turntables are just not very sturdy.
Rogue Turntable July 06, 2008 06:51AM Registered: 5 years ago Posts: 193.
The problem with the vinyl turntable play putting out 90% of its volume on one speaker seems to be continuing.
Turntable.fm: Mac Life's New Obsession Brings The Music Party to the Internet.
Robotic-Welding System with Dual-Work-Zone Turntable.
Lincoln Electric Co. Cleveland, OH, has debuted the System 20 robotic-welding system with a dual-work-zone turntable.
Upgrading turntable cartridge can be tricky.

In science:

As the turntable rotates a bound on Lorentz violation is obtained in the following manner.
Modern tests of Lorentz invariance
In principle, other periods can be introduced by rotating turntables as has been done for example in some cavity experiments .
Tests of Lorentz Symmetry with Penning Traps and Antihydrogen
The system is maintained in a thermally insulated and vibration isolated vacuum chamber, which is mounted on a turntable with a period of 45 seconds.
Atomic and optical tests of Lorentz symmetry
This and other experiments have utilized such rotating turntables to improve precisions over earlier versions that relied on the rotation of the earth to seek anisotropies.
Atomic and optical tests of Lorentz symmetry
Our measurement compares the resonance frequencies of two orthogonal optical resonators that are implemented in a single block of fused silica and are rotated continuously on a precision air bearing turntable.
Rotating optical cavity experiment testing Lorentz invariance at the 10^{-17} level