idle wheel

idle wheel

noun Machinery.
1.
a wheel for transmitting power and motion between a driving and a driven part, either by friction or by means of teeth.

Origin:
1795–1805
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Idle wheel is always a great word to know.
So is bezoar. Does it mean:
a scrap or morsel of food left at a meal.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
Collins
World English Dictionary
idle wheel
 
n
Also called: idler a gearwheel interposed between two others to transmit torque without changing the direction of rotation to the velocity ratio

Collins English Dictionary - Complete & Unabridged 10th Edition
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