What is the meaning of menstruation?

noun

• The monthly discharge of blood from the uterus of nonpregnant women from puberty to menopause."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
  • synonyms: menses, menstruum, catamenia, period, flow