/ Dictionary / Index M monotrematous: Meaning and Definition of Find definitions for: mon•o•trem•a•tous Pronunciation: (mon"u-trem'u-tus, -trē'mu-), [key] — adj. of or pertaining to a monotreme. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. monotony monotreme Related Content Daily Word Quiz: placid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language