noun (n)

• the monthly discharge of blood from the uterus of nonpregnant women from puberty to menopause(noun.process)

  Example:
  A woman does not take the gout unless her menses be stopped.
  

  Synonym:
  catamenia, flow, menstruation, menstruum, period
  

  source: wordnet30
• The catamenial or menstrual discharge, a periodic flow of blood or bloody fluid from the uterus or female generative organs.(noun)

  source: webster1913