Etymology
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unicycle (n.)

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

updated on September 11, 2012

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Definitions of unicycle from WordNet
1
unicycle (v.)
ride a unicycle;
2
unicycle (n.)
a vehicle with a single wheel that is driven by pedals;
Synonyms: monocycle
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.