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menstruation
(men″stroo-a´shәn)
the periodic discharge from the vagina of blood and tissues from a nonpregnant uterus; the culmination of the menstrual cycle. Menstruation occurs every 28 days or so between puberty and menopause, except during pregnancy, and the flow lasts about 5 days, the times varying from woman to woman. See also dysmenorrhea.
anovular menstruation
, anovulatory menstruation
periodic uterine bleeding without preceding ovulation.
vicarious menstruation
bleeding from extragenital mucous membrane at the time one would normally expect the menstrual period.
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