[men-stroo-uhm, -struhm]
noun, plural menstruums, menstrua [men-stroo-uh, -struh] .
a solvent.

1350–1400; special use of Middle English menstruum monthly period < Medieval Latin (in L only plural mēnstrua occurs). See menstrual Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
menstruum (ˈmɛnstrʊəm)
n , pl -struums, -strua
1.  a solvent, esp one used in the preparation of a drug
2.  a solid formulation of a drug
[C17 (meaning: solvent), C14 (menstrual discharge): from Medieval Latin, from Latin mēnstruus monthly, from mēnsis month; from an alchemical comparison between a base metal being transmuted into gold and the supposed action of the menses]

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American Heritage
Medical Dictionary

menstruum men·stru·um (měn'strōō-əm)
n. pl. men·stru·ums or men·stru·a (-strōō-ə)
A solvent, especially one used in extracting compounds from plant and animal tissues and preparing drugs.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
No obvious lag periods or shoulders and tailing were evident in any of the survivor curves of bacteria heated in this menstruum.
The resulting chemical complex is unstable and quickly hydrolyzes to various products dependent on the pH of the menstruum.
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