menstruation(n = noun.process) catamenia, flow, menses, menstruum, period - 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"; "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"
menstruation, n. the process of discharging blood and other materials from the uterus in sexually mature non-pregnant women at intervals of about one lunar month until the menopause.
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