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axle a bar or shaft on which a wheel or wheels turn.
barrow1 a flat frame used for carrying a load. A barrow has two handles at each end or handles at one end and a wheel at the other; wheelbarrow.
bobsled a long racing sled with two separate sets of runners, a steering wheel, and brakes. [1/2 definitions]
buff1 a stick or wheel covered with a soft cloth or piece of leather, used for cleaning or shining. [1/4 definitions]
cartwheel a sideways somersault with the arms and legs held out straight like the spokes of a wheel. [2 definitions]
fender a metal guard over the wheel of a truck, car, or bicycle. [1/2 definitions]
Ferris wheel a ride at a carnival or amusement park made of a very large upright wheel with seats hanging from the rim. A motor turns the wheel while people sit in the seats.
grindstone a stone wheel that is turned to sharpen knives and tools, grind grain, or sand and shape items by rubbing or scraping.
gyroscope an instrument with a turning wheel, mounted on an axis that can turn in any direction. When the axis turns, the wheel stays level. Gyroscopes are used to help keep ships and airplanes on course.
helm a wheel or lever used for steering a ship.
hub the turning center part of a wheel to which spokes and other parts are connected. [1/2 definitions]
hubcap a round metal cover over the hub of a car wheel.
paddle wheel a wheel that has boards or paddles fixed at right angles around it. A paddle wheel is used to move a river steamboat.
pinwheel a plastic or paper toy, similar to a windmill, that is pinned to a stick and has a wheel that is spun by the wind or someone's breath.
pulley a simple machine that makes lifting something easier. A pulley has a wheel or set of wheels with grooves that a rope or chain can be pulled over.
roller a wheel attached to the bottom of a heavy object to make it easier to move. [1/4 definitions]
scooter a child's toy that has a steering handle attached to a low board with one wheel at each end. A scooter is ridden by standing with one foot on the board while using the other foot to push against the ground.
spoke2 a rod or bar that goes from the center of a wheel to the rim.
steering wheel a wheel that is turned by a driver, pilot, or the like to control the direction of a land vehicle, boat, or aircraft.
tire2 a rubber covering that fits around the rim of a wheel. Tires are usually filled with air.
treadmill a belt or circle of moving steps that, when walked by a person or animal, causes a wheel to turn. Treadmills are used to run machines or to give people exercise.