pulley

[pool-ee]
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; Middle English poley, puly < Middle French polieMedieval Greek *polídion little pivot, equivalent to pól(os) pole2 + -idion diminutive suffix

pulleyless, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pulley (ˈpʊlɪ)
 
n
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
 
[C14 poley, from Old French polie, from Vulgar Latin polidium (unattested), apparently from Late Greek polidion (unattested) a little pole, from Greek polos axis]

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Etymonline
Word Origin & History

pulley
1324, from O.Fr. polie (c.1150), from M.L. poliva, from Medieval Gk. *polidia, pl. of *polidion "little pivot," dim. of Gk. polos "pivot, axis" (see pole (2)).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
pulley   (pl'ē)  Pronunciation Key 
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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Example sentences
His camera swoops through and around gleaming gears and flywheels, levers and
  pulleys, pistons and locomotives.
Both lines would go around pulleys, the flying lines' pulleys attached to a
  gear train to a generator.
In the steam era a giant engine powered a central rotating shaft, and machine
  tools ran off pulleys in long linear factories.
The tenants, using pulleys and levers, take apart the house leaving only the
  facade.
Synonyms
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