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dominant course (suggestive of running water) of successive events or ideas; "two streams of development run through American history"; "stream of consciousness"; "the flow of thought"; "the current of history"
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