/ Dictionary / Index M monopetalous: Meaning and Definition of Find definitions for: mon•o•pet•al•ous Pronunciation: (mon"u-pet'l-us), [key] — adj. Bot. gamopetalous. having only one petal, as a corolla. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. mononucleosis monophagia Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language