/ Dictionary / Index M monestrous: Meaning and Definition of Find definitions for: mon•es•trous Pronunciation: (mon-es'trus), [key] — adj. of or pertaining to a mammal that has one estrus period per breeding season, as the dog. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: monestrous (Thesaurus) Monessen Monet 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