menstruation

synonym: menses
https://doi.org/10.1351/goldbook.10937

Cyclic endometrial shedding and discharge of a bloody fluid from the uterus during the menstrual cycle.

Source:
PAC, 2016, 88, 713. (Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)) on page 777 [Terms] [Paper]