/ Dictionary / Index M menstruous: Meaning and Definition of Find definitions for: men•stru•ous Pronunciation: (men'str-us, -strus), [key] — adj. pertaining to menstruation. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. menstruation menstruum 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