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pulley

[poo l-ee] /ˈpʊl i/
noun, plural pulleys.
1.
a wheel, with a grooved rim for carrying a line, that turns in a frame or block and serves to change the direction of or to transmit force, as when one end of the line is pulled to raise a weight at the other end: one of the simple machines.
2.
a combination of such wheels in a block, or of such wheels or blocks in a tackle, to increase the force applied.
3.
a wheel driven by or driving a belt or the like, used to deliver force to a machine, another belt, etc., at a certain speed and torque.
Origin
1275-1325
1275-1325; Middle English poley, puly < Middle French polieMedieval Greek *polídion little pivot, equivalent to pól(os) pole2 + -idion diminutive suffix
Related forms
pulleyless, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for pulley
  • The cameraman has to use a pulley to pull the camera back up to the top after each dive.
  • To work the machines, you use a big wooden lever to slide the belt from the dummy pulley to the power pulley.
  • Inside, a float goes up and down with the water level, moving a pulley that drives a recording device.
  • For the next two hours, the scientists took blood and fat samples and weighed the bears using a stretcher and pulley.
  • The prisoners are fed by means of two baskets on a pulley.
  • They tend to operate on pulley systems that derive tension from stacks of weights or heavy-duty rubber.
  • They tend to operate on pulley systems that derive tension from stacks of weights or heavy-duty rubber bands.
  • But that did not stop him from buying an old wooden pulley and a tool for lifting railroad ties.
  • And since the mechanism's chain-driven pulley jockeys generate power, battery life is measured in years.
  • Outside, there is a wooden beam, which was part of a pulley that hoisted hay.
British Dictionary definitions for pulley

pulley

/ˈpʊlɪ/
noun
1.
a wheel with a grooved rim in which a rope, chain, or belt can run in order to change the direction or point of application of a force applied to the rope, etc
2.
a number of such wheels pivoted in parallel in a block, used to raise heavy loads
3.
a wheel with a flat, convex, or grooved rim mounted on a shaft and driven by or driving a belt passing around it
Word Origin
C14 poley, from Old French polie, from Vulgar Latin polidium (unattested), apparently from Late Greek polidion (unattested) a little pole, from Greek polos axis
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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Word Origin and History for pulley
n.

late 13c., from Old French polie, pulie "pulley, windlass" (12c.) and directly from Medieval Latin poliva, puliva, probably from Medieval Greek *polidia, plural of *polidion "little pivot," diminutive of Greek polos "pivot, axis" (see pole (n.2)). As a verb from 1590s.

Online Etymology Dictionary, © 2010 Douglas Harper
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pulley in Science
pulley
  (pl'ē)   
A machine consisting of a wheel over which a pulled rope or chain runs to change the direction of the pull used for lifting a load. Combinations of two or more pulleys working together reduce the force needed to lift a load. See also block and tackle.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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