menstruate/ˈmɛnstɹʊeɪt/EtymologyFrom menstruum + -ate (verb-forming suffix); sense 2 (“to undergo menstruation”) is possibly a back-formation from menstruation.verbTo stain with or as if with menses.To undergo menstruation, to have a period.“A woman may have every quality or attribute of marriageableness who menstruates irregularly, or rarely, or even who has never menstruated at all.”adjMenstrual.