noun, plural men·stru·ums, men·stru·a [men-stroo-uh, -struh] /ˈmɛn stru ə, -strə/.
Origin of menstruum
Examples from the Web for menstruum
When the menstruum is water, a little spirit is added, to make the product keep.
In that of the taverns and gin-shops the menstruum is usually gin, or plain spirit reduced to a corresponding strength.
The statements in this book regarding alcohol content are approximate and are based on the alcohol contents of the menstruum used.
When spirit is the menstruum, the liquid receives the name of alcoholic solution, spirit, or tincture.Cooley's Practical Receipts, Volume II|Arnold Cooley
These colloids appear to be separated by amyl alcohol in virtue of their greater solubility in that menstruum.