/ Dictionary / Index M monoestrous: Meaning and Definition of Find definitions for: mon•oes•trous Pronunciation: (mon-es'trus, -ē'strus), [key] — adj. monestrous. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: monoestrous (Thesaurus) monoester monofilament Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language