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Related to unicyclist: unicycle
1. A vehicle typically consisting of a saddle mounted over a single wheel and propelled by pedals.
2. Any of various other single-wheeled vehicles.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.