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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.
trolley a pulley wheel held against or traveling on a track or overhead wire. Trolleys conduct electricity from the wire to a vehicle on a track. [1/4 definitions]
turn a complete revolution of a wheel or other round object. [1/22 definitions]
whirl to turn or change direction suddenly; wheel about. [1/8 definitions]
windmill a machine that uses energy from the wind to turn a large wheel. Windmills are used to grind grain into flour, pump water, and make electricity.