The Collaborative International Dictionary
Menstruum \Men"stru*um\, n.; pl. E. Menstruums, L. Menstrua. Any substance which dissolves a solid body; a solvent.
The proper menstruum to dissolve metal.
All liquors are called menstruums which are used as
dissolvents, or to extract the virtues of ingredients
by infusion or decoction.
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.
n. (plural of menstruum English)
n. (archaic) a solvent
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, catamenia, period, flow]
[also: menstrua (pl)]