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WordReference Random House Unabridged Dictionary of American English © 2016
men•stru•um  (menstro̅o̅ əm, -strəm),USA pronunciation n., pl.  -stru•ums, -stru•a 
    (-stro̅o̅ ə).USA pronunciation 
  1. a solvent.
  • Medieval Latin (in Latin only plural mēnstrua occurs). See menstrual
  • special use of Middle English menstruum monthly period 1350–1400

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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