
A quadracycle is a four-wheeled human-powered land vehicle. It is also referred to as a quadricycle, quadcycle, pedal car, four-wheeled bicycle or quike amongst other terms. Human-powered quadracyles have been in use since 1853 and have grown into several families of vehicles for a variety of purposes, including tourist rentals, pedal taxis, priva...
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http://en.wikipedia.org/wiki/Quadracycle

A bike with four wheels, for those who have serious issues with balance. Can serve as a kind of methadone for automobile addicts too frightened to go cold turkey.
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http://www.bikereader.com/contributors/SAM/glossary.html
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