menstruation
cyclic, physiologic discharge through the vagina of blood and endometrial tissues from the nonpregnant uterus
en-GB/ˌmɛnstɹʊˈeɪʃn/
en-US/ˌmɛnstɹuˈeɪʃən/
cyclic, physiologic discharge through the vagina of blood and endometrial tissues from the nonpregnant uterus