Dictionary![]() ![]() mon•o•railPronunciation: (mon'u-rāl"), [key] —n. 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. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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