menstruum

Noun
  1. (archaic) a solvent (synset 114974439)
  2. The monthly discharge of blood from the uterus of nonpregnant women from puberty to menopause (synset 113534950)
    "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"

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