Etymology
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pulley (n.)

simple machine consisting of a wheel with a grooved rim for carrying a rope or other line and turning in a frame, used for raising a weight, late 13c., puli, from Old French polie, pulie "pulley, windlass" (12c.) and directly from Medieval Latin poliva, puliva, which according to Barnhart and Klein is 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.

updated on February 14, 2021

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Definitions of pulley from WordNet

pulley (n.)
a simple machine consisting of a wheel with a groove in which a rope can run to change the direction or point of application of a force applied to the rope;
Synonyms: pulley-block / pulley block / block
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.