Noun menstruum has 2 senses
  1. menstruum - (archaic) a solvent
    --1 is a kind of
    solvent, dissolvent, dissolver, dissolving agent, resolvent
  2. menstruation, menses, menstruum, catamenia, period, flow - 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
    --2 is a kind of discharge, emission, expelling
    --2 has particulars: menorrhagia, hypermenorrhea; oligomenorrhea
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