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WordNet (r) 3.0 (2006) (WordNet)

menstruation
n 1: 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 [synonym: {menstruation},
{menses}, {menstruum}, {catamenia}, {period}, {flow}]