/ · 1894 Brewer’s · M · Menstruum means a monthly dissolvent (Latin, mensis)
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from the notion of the alchemists that it acted only at the full of the moon.
“All liquors are called menstruums which are used as dissolvents, or to extract the virtues of ingredients by infusion or decoction.”—Quincy.
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Entry taken from Dictionary of Phrase and Fable, edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.
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