menstruation
nounUK /ˌmenstruˈeɪʃn/
US /ˌmenstruˈeɪʃn/
The monthly bleeding that happens when a woman or girl is not pregnant.
She keeps track of her menstruation on a calendar.
OTHER MEANINGS
2. The process or state of discharging blood and tissue from the uterus.
Menstruation usually lasts a few days each month.
3. The time during which this bleeding occurs.
During menstruation, some people use pads or tampons.
4. The regular monthly cycle in which the body prepares for possible pregnancy.
Menstruation is a normal part of the reproductive cycle.