is the discharge of blood and endmetrial tissue from the uterus through the vagina in women which marks the end of the menstrual cycle.

MENSTRUATION: "Fairly painful, menstruation involves losing a clump of blood and endometrial tissue from a woman's uterus."
Cite this page: N., Pam M.S., "MENSTRUATION," in, April 7, 2013, (accessed September 26, 2021).