/ Dictionary / Index M monorail: Meaning and Definition of Find definitions for: mon•o•rail Pronunciation: (mon'u-rāl"), [key] — n. a single rail functioning as a track for wheeled vehicles, as railroad or other cars, balanced upon or suspended from it. a railroad or other transportation system using such a rail. a vehicle traveling on such a rail. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: monorail (Thesaurus) monopteros monorchid Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language