the rotating disk that spins the record on a phonograph.
Railroads. a rotating, track-bearing platform pivoted in the center, used for turning locomotives and cars around.
a rotating stand used in sculpture, metalwork, and ceramics.

1825–35; turn + table

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World English Dictionary
turntable (ˈtɜːnˌteɪbəl)
1.  the circular horizontal platform that rotates a gramophone record while it is being played
2.  a flat circular platform that can be rotated about its centre, used for turning locomotives and cars
3.  the revolvable platform on a microscope on which specimens are examined

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

1835, originally in the railroad sense, from turn + table. The record player sense is attested from 1908.
Online Etymology Dictionary, © 2010 Douglas Harper
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Encyclopedia Britannica


in sound reproduction, rotating platform that carries a phonograph record. Turntables commonly revolve at 16 23, 33 13, 45, or 78 revolutions per minute; many record players have gearing that allows the user to choose among these speeds. For best sound reproduction, constant turning speed is crucial; transcription turntables used by radio stations are weighted to minimize speed variations and are driven by synchronous motors. Though several different types of driving mechanism were tried in early phonographs, the electric motor, cushion-mounted to minimize vibration, became the most widely employed.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
He still listens to records on a turntable and wears white shirts with red
The round turntable holds two pipe molds, one empty, and one being filled.
The turntable had been retrofitted with a hydraulic piston which replaced the
  slew ring worm gears.
Even if the microwave oven has a turntable, it's still helpful to stir and turn
  food top to bottom.
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