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1. (Automotive Engineering) a car or coach that runs on a single rail and is stabilized by gyroscopes that move in opposing directions
2. (Automotive Engineering) a motor car with two wheels that has gyroscopes that govern its stability and the direction in which it travels
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014