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driving wheel

noun
1.
Machinery. a main wheel that communicates motion to others.
2.
Also called driver. Railroads. one of the wheels of a locomotive that transmits the power of an engine or motor into tractive effort.
Origin
1830-1840
1830-40
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for driving-wheel

driving wheel

noun
1.
a wheel, esp a gear wheel, that causes other wheels to rotate
2.
any wheel of a vehicle that transforms torque into a tractive force
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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