/ Dictionary / Index M menstruate: Meaning and Definition of Find definitions for: men•stru•ate Pronunciation: (men'str-āt", -strāt), [key] — -at•ed, -at•ing. to undergo menstruation. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: menstruate (Thesaurus) menstrual extraction menstruation 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