menstrua

menstruum

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

Origin:
1350–1400; special use of Middle English menstruum monthly period < Medieval Latin (in L only plural mēnstrua occurs). See menstrual

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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
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