pinion and ring gear

Definitions of pinion and ring gear
  1. noun
    gears that mesh at an angle
    synonyms: bevel gear, pinion and crown wheel
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    differential, differential gear
    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
    type of:
    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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