(n): a simple machine consisting of a circular frame with spokes (or a solid disc) that can rotate on a shaft or axle (as in vehicles or other machines)
(n): acrobatic revolutions with the body turned sideways and the arms and legs outstretched like the spokes of a wheel
(n): a stunt performed by an acrobat
(n): a dollar made of silver
(n): a United States coin worth one dollar
(v): do cartwheels: perform an acrobatic movement using both hands and feet
(v): change directions as if revolving on a pivot
A hat that looks like this.