menstrual /ˈmɛn.stɹu.əl/adjective 3noun 1forms 1 adjective3 •Of or relating to the menses. •(old-fashioned) Occurring once a month; monthly. •(old-fashioned) Lasting for a month. noun1 •(informal) A menstrual period.“All that drama for what” I thought. All she had to do was tell me that I was having my menstrual. So much for band aids. — 2012 formsmenstruals