Menses (noun)

1. The menstrual period; the flow of blood and other materials from the uterus.
2. The physiological process in which the uterus sheds its lining and blood is discharged from the body through the vagina.

Origin:

From the latin word "mensis" meaning "month".

Examples:

1. She was experiencing menses once a month.
2. The onset of menses is a sign of puberty in girls.
3. Some women experience cramping and bloating during menses.
4. The duration of menses can vary from woman to woman.
5. Some women choose to use tampons or menstrual cups during menses.