01 n. Any substance which dissolves a solid body; a solvent.
pl.
Menstruums, Menstrua ((#))
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1.
Any substance which dissolves a solid body; a solvent.“The proper menstruum to dissolve metal.” — Bacon.“All liquors are called menstruums which are used as dissolvents, or to extract the virtues of ingredients by infusion or decoction.” — Quincy.