[ 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.

Nearby words

  1. unicorn plant,
  2. unicorn uterus,
  3. unicornous,
  4. unicostate,
  5. unicuspid,
  6. unidentifiable,
  7. unidentified,
  8. unidentified flying object,
  9. unidimensional,
  10. unidirectional

Origin of unicycle

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

Related formsu·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 Formsunicyclist, 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

Word Origin and History for unicycle



1869, American English, from Latin uni- "one" (see uni-) + -cycle, from bicycle (from Greek kyklos "circle, wheel").

Online Etymology Dictionary, © 2010 Douglas Harper