menstruation (n)

Definition: 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.