Collins Concise English Dictionary © HarperCollins Publishers::

menstruum /ˈmɛnstrʊəm/ n ( pl -struums, -strua / -strʊə/) obsolete
  1. a solvent, esp one used in the preparation of a drug
Etymology: 17th Century (meaning: solvent), C14 (menstrual discharge): from Medieval Latin, from Latin mēnstruus monthly, from mēnsis month; from an alchemical comparison between a base metal being transmuted into gold and the supposed action of the menses



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