Definition of "unicycle" []

• A vehicle consisting of a frame mounted over a single wheel and usually propelled by pedals. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "But because a unicycle is always trying to fall over, most people cannot react quickly enough to control it, and no mechanical device had previously been able to."
• "Riding a unicycle is as precarious as it looks -- the "cone of balance," as Peck calls it, is extraordinarily precise."
• "One person questioned whether riding a unicycle is an appropriate activity for"