menstruum

noun
men·​stru·​um | \ˈmen(t)-strü-əm, -strəm\
plural menstruums or menstrua\ -​strü-​ə, -​strə \

Definition of menstruum 

: a substance that dissolves a solid or holds it in suspension : solvent

First Known Use of menstruum

1559, in the meaning defined above

History and Etymology for menstruum

Medieval Latin, literally, menses, alteration of Latin menstrua

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The first known use of menstruum was in 1559

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menstruum

noun
men·​stru·​um | \ˈmen(t)-strə(-wə)m \
plural menstruums or -strua\ -​str(ə-​w)ə \

Medical Definition of menstruum 

: a substance that dissolves a solid or holds it in suspension : solvent

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