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n. pl. men·stru·ums or men·stru·a (-stro͞o-ə)
A solvent, especially one used in extracting compounds from the tissues of organisms.

[Middle English, menstruation, from Medieval Latin mēnstruum, sing. of Latin mēnstrua, menses; see menstruate.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


n, pl -struums or -strua (-strʊə)
1. (Pharmacology) a solvent, esp one used in the preparation of a drug
2. (Pharmacology) 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]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈsɒl vənt)

1. able to pay all just debts.
2. having the power of dissolving; causing solution.
3. a substance that dissolves another to form a solution: Water is a solvent for sugar.
4. something that solves or explains.
[1620–30; < Latin solvent-, s. of solvēns, present participle of solvere to loosen. See solve, -ent]
sol′vent•ly, adv.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.menstruum - (archaic) a solvent
archaicism, archaism - the use of an archaic expression
dissolvent, dissolver, dissolving agent, resolvent, solvent - a liquid substance capable of dissolving other substances; "the solvent does not change its state in forming a solution"
2.menstruum - the monthly discharge of blood from the uterus of nonpregnant women from puberty to menopausemenstruum - the monthly discharge of blood from the uterus of nonpregnant women from puberty to menopause; "the women were sickly and subject to excessive menstruation"; "a woman does not take the gout unless her menses be stopped"--Hippocrates; "the semen begins to appear in males and to be emitted at the same time of life that the catamenia begin to flow in females"--Aristotle
expelling, discharge, emission - any of several bodily processes by which substances go out of the body; "the discharge of pus"
hypermenorrhea, menorrhagia - abnormally heavy or prolonged menstruation; can be a symptom of uterine tumors and can lead to anemia if prolonged
oligomenorrhea - abnormally light or infrequent menstruation
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in classic literature ?
But Ikey was timid, and his hopes remained insoluble in the menstruum of his backwardness and fears.
Water dissolves wood and iron and salt; air dissolves water; electric fire dissolves air, but the intellect dissolves fire, gravity, laws, method, and the subtlest unnamed relations of nature in its resistless menstruum. Intellect lies behind genius, which is intellect constructive.
The menstruum used was ethanol (Sigma-Aldrich) of analytical grade which was added till all the sample was fully soaked and macerated for 3 days with constant shaking.