u•ni•cy•clePronunciation: (yOO'nu-sī"kul), [key]
—n., v., -cled, -cling.
a vehicle with one wheel, esp. a pedal-driven device kept upright and steered by body balance, commonly used by acrobats and other performers.
to ride a unicycle.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.