pinion and crown wheel


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Noun1.pinion and crown wheel - gears that mesh at an anglepinion and crown wheel - gears that mesh at an angle    
differential gear, differential - a bevel gear that permits rotation of two shafts at different speeds; used on the rear axle of automobiles to allow wheels to rotate at different speeds on curves
cogwheel, gear, gear wheel, geared wheel - a toothed wheel that engages another toothed mechanism in order to change the speed or direction of transmitted motion
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