Finally, he believes that menstruation is probably determined by the act of “denidation,” as he calls it, because it is from the denided surface that the menstrual flow comes.
the breakup and expulsion of the endometrium during menstruation
الواصلة
the break·up and ex·pul·sion of the en·do·me·tri·um dur·ing men·stru·a·tion