mono rail

monorail

[mon-uh-reyl]
noun
1.
a single rail functioning as a track for wheeled vehicles, as railroad or other cars, balanced upon or suspended from it.
2.
a railroad or other transportation system using such a rail.
3.
a vehicle traveling on such a rail.

Origin:
1895–1900; mono- + rail1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
monorail (ˈmɒnəʊˌreɪl)
 
n
a single-rail railway, often elevated and with suspended cars

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

monorail
1897, coined from mono- + rail (n.1).
Online Etymology Dictionary, © 2010 Douglas Harper
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