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axle An axle is a round bar that is set between two wheels, as on a car. Because cars usually have four wheels, they usually have two axles. Each pair of wheels turns around its axle.
ball bearing a machine part made of a groove in the shape of a circle with metal balls that roll in it. A ball bearing lets an axle or other part move easily.
wheel a round frame that turns on the axle. Wheels are found on cars, trucks, bikes, wagons and other things. [1/6 definitions]