monowheel ( synonym found)
Definition of monowheel:

°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... — Mary Hastings Bradley, Caravans and Cannibals (1926)"
Definition of monowheel:

°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... — Mary Hastings Bradley, Caravans and Cannibals (1926)"
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