Definition: menses

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Source: WordNet (r) 1.7 

menses
     n : 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 [syn: menstruation,
          catamenia, period, flow]

Source: Webster's Revised Unabridged Dictionary (1913) 

Menses \Men"ses\, n. pl. [L. mensis month, pl. menses months,
   and the monthly courses of women. Cf. Month.] (Med.)
   The catamenial or menstrual discharge, a periodic flow of
   blood or bloody fluid from the uterus or female generative
   organs.