The first portion of the uterine cycle, the portion in which the endometrial lining sloughs away.
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
Shedding of the lining of the uterus during a menstrual period.
Monthly flow of bloody fluid from the uterus through the vagina in adult women between puberty and menopause.
The more-or-less monthly sloughing of the uterine lining which results in a bloody discharge from the vaginal opening.
The monthly flow of blood that indicates ovulation.
periodic flow of blood and tissue from the uterus; menstruation
Menses, or Menstruation, is the hormonally regulated shedding of the uterine lining. This event occurs, on average, every 28 days until menopause.