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mono- +‎ wheel


monowheel (plural monowheels)

  1. A vehicle similar to a unicycle, its rider sitting within or adjacent to the single wheel.
    • 1926, Mary Hastings Bradley, Caravans and Cannibals
      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 []