Menstruation

noun

1. The monthly flow of blood and cellular debris from the uterus that begins at puberty in women and the females of certain other primates. In women, menstruation ceases at menopause.
2. The act of menstruating or discharging the menses.
3. The period of menstruating.
4. The discharge of the menses; also, the state or the period of menstruating.
5. The periodic discharging of the menses, the flow of blood and cells from the lining of the uterus in females of humans and other primates.