menstruum

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menstruum

 [men´stroo-um]
a solvent medium.

men·stru·um

, pl.

men·stru·a

(men'strū-ŭm, -stroo-ă),
Older term for solvent.
[Mediev. L. menstrual fluid, thought to possess certain solvent properties, ntr. of L. menstruus, monthly]

menstruum

(mĕn′stro͞o-əm)
n. pl. men·struums or men·strua (-stro͞o-ə)
A solvent, especially one used in extracting compounds from the tissues of organisms.

menstruum

(1) A solvent formerly used in pharmacology to extract medicinals from plants.
(2) A term of waning use for menstrual blood; i.e., menses.