Definition of pulley noun from the Oxford Advanced Learner's Dictionary

 

pulley

 noun
noun
BrE BrE//ˈpʊli//
 
; NAmE NAmE//ˈpʊli//
 
 
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a wheel or set of wheels over which a rope or chain is pulled in order to lift or lower heavy objects a system of ropes and pulleys The scenery was moved across the stage by ropes and pulleys. a system of chains passing over pulleys Word Origin Middle English: from Old French polie, probably from a medieval Greek diminutive of polos ‘pivot, axis’.
See the Oxford Advanced American Dictionary entry: pulley