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menstruum

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men⋅stru⋅um

[men-stroo-uhm, -struhm]
–noun, plural -stru⋅ums, -stru⋅a [-stroo-uh] .
a solvent.

Origin:
1350–1400; special use of ME menstruum monthly period < ML (in L only pl. mēnstrua occurs). See menstrual
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
Cite This Source Link To 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.

[Middle English, menstruation, from Medieval Latin mēnstruum, sing. of Latin mēnstrua, menses; see menstruate.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Medical Dictionary

Main Entry: men·stru·um
Pronunciation: 'men(t)-str&(-w&)m
Function: noun
Inflected Form: plural men·stru·ums or men·strua /-str(&-w)&/
: a substance that dissolves a solid or holds it in suspension : SOLVENT
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Medical Dictionary

menstruum men·stru·um (měn'str&oomacr;-əm)
n. pl. men·stru·ums or men·stru·a (-str&oomacr;-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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