wheel

A wheel is a round thing (circle) on a cart or carriage or train or other machine that moves. A cart has four wheels that touch the road and turn.

Example: The cart needs a very smooth road because it has little wheels.

If you wheel something somewhere, you transport it in or on a vehicle that has wheels.

Example: The nurses wheeled her into the operating theatre.

If something is wheeling, it is travelling in circles.

Example: The eagle wheeled and dived towards the ground to catch its prey.