One of the mysteries of the English language finally explained.
1Engineering a graduated metal disc used to support a workpiece to enable the operator to drill or cut at exact angular intervals about an axis.
2Oil Industry (in rotary drilling) a power-driven steel turntable through the middle of which the drill string passes and by which it is turned.
Mid 19th century; earliest use found in Frederick Simms (1803–1865), engineer and technical writer.
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