/ Dictionary / Index M monocycle: Meaning and Definition of Find definitions for: mon•o•cy•cle Pronunciation: (mon'u-sī"kul), [key] — n. a one-wheeled vehicle. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: monocycle (Thesaurus) monoculture monocyclic Related Content Daily Word Quiz: denizen Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language