grinding wheel

noun
a wheel composed of abrasive material, used for grinding.

Origin:
1785–95

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
grinding wheel
 
n
an abrasive wheel, usually a composite of hard particles in a resin filler, used for grinding

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
First, the knife is reshaped and repaired, using a grinding wheel and water.
Worker, a machine operator, was using a grinding machine and the grinding wheel
  on the machine broke into pieces.
The employee was trying to measure the groove while the table was moving back
  and forth beneath the grinding wheel.
The stone grinding wheel, once used to sharpen whaling tools, lies near the
  site baseline.
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