Metrorrhagia: Uterine bleeding at irregular intervals, particularly between the expected menstrual periods. Metrorrhagia may be a sign of an underlying disorder, such as hormone imbalance, endometriosis, uterine fibroids or, less commonly, cancer of the uterus. Metrorrhagia may cause significant anemia. See also: Menometrorrhagia; Menorrhagia.
