Unicycle (noun)

A vehicle with one wheel that is moved by pedals.

Origin:

The word unicycle is formed from the prefix "uni" meaning one and the root word "cycle" meaning a vehicle with two or more wheels that is moved by pedals.

Examples:

1. The unicycle was hard to balance on, but once I got the hang of it, it was fun to ride.
2. I saw a unicycle performer at the circus, riding and juggling at the same time.
3. The unicycle was a popular mode of transportation in the 1800s.
4. I bought a unicycle for my son as a birthday gift.
5. Riding a unicycle requires balance and skill.