Part of speech: Noun
the monthly discharge of blood from the uterus of nonpregnant women from puberty to menopause
Example: the women were sickly and subject to excessive menstruation; a woman does not take the gout unless her menses be stopped"--Hippocrates; the semen begins to appear in males and to be emitted at the same time of life that the catamenia begin to flow in females"--Aristotle
The word "catamenia" comes from Ancient Greek καταμήνια.
Ancient Greek philosophy and science introduced thousands of precise technical terms still used today.