[ yoo-nuh-sahy-kuh l ]
/ ˈyu nəˌsaɪ kəl /


a vehicle with one wheel, especially a pedal-driven device kept upright and steered by body balance, commonly used by acrobats and other performers.

verb (used without object), u·ni·cy·cled, u·ni·cy·cling.

to ride a unicycle.

Origin of unicycle

An Americanism dating back to 1865–70; uni- + cycle

Related forms

u·ni·cy·clist, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for unicycle

British Dictionary definitions for unicycle


/ (ˈjuːnɪˌsaɪkəl) /


a one-wheeled vehicle driven by pedals, esp one used in a circus, etcAlso called: monocycle

Derived Forms

unicyclist, noun

Word Origin for unicycle

from uni- + cycle, on the model of tricycle
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012