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2 definitions found
 for menstruum
From The Collaborative International Dictionary of English v.0.48 :

  Menstruum \Men"stru*um\, n.; pl. E. Menstruums, L. Menstrua.
     [L. menstruus. See Menstruous.]
     Any substance which dissolves a solid body; a solvent.
     [1913 Webster]
  
           The proper menstruum to dissolve metal.  --Bacon.
     [1913 Webster]
  
           All liquors are called menstruums which are used as
           dissolvents, or to extract the virtues of ingredients
           by infusion or decoction.                --Quincy.
     [1913 Webster]
  
     Note: The use is supposed to have originated in some notion
           of the old chemists about the influence of the moon in
           the preparation of dissolvents. --Johnson.
           [1913 Webster]

From WordNet (r) 3.0 (2006) :

  menstruum
      n 1: (archaic) a solvent
      2: 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, menses, menstruum,
         catamenia, period, flow]

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