Menstruation <!-- google_ad_client = "ca-pub-2327677141881672"; /* Short title Links */ google_ad_slot = "3055805829"; google_ad_width = 468; google_ad_height = 15; //-->

Periodical cycle in women wherein once a month an egg is released from the ovary, and the uterine wall is thickened to prepare for the fertilized egg to settle in it. If fertilization does not occur, then for 3-6 days the uterine lining sheds with discharge of blood.