monowheel
nounEtymology From mono- + wheel.
1
A vehicle similar to a unicycle, its rider sitting within or adjacent to the single wheel.
- We had bought the monowheel at Portal, where it had been left for sale by an absent missionary; it was a single bicycle wheel with a seat arranged on it […]1926, Mary Hastings Bradley, Caravans and Cannibals:
- Derived terms
- monowheel tractor