Rotiform is an adjective that means wheel-shaped. 

The Latin word rota (ROE tuh) means ‘wheel.’ The addition of the suffix I-F-O-R-M gets us a word that means ‘shaped like a wheel.’ Here’s an example:

All those rotiform objects in that boring art museum sent my mind elsewhere. It reminded me of the car and how I wished I could just leave the museum and drive away.