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idle wheel

noun, Machinery
a wheel for transmitting power and motion between a driving and a driven part, either by friction or by means of teeth.
Origin of idle wheel
1795-1805 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for idle-wheel

idle wheel

a gearwheel interposed between two others to transmit torque without changing the direction of rotation to the velocity ratio Also called idler
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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