Definition of Epsom salts 

: a bitter colorless or white crystalline salt MgSO4·7H2O that is a hydrated magnesium sulfate with cathartic properties

First Known Use of Epsom salts

1828, in the meaning defined above

History and Etymology for Epsom salts

Epsom, England

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The first known use of Epsom salts was in 1828

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Medical Definition of Epsom salts 

: a bitter white crystalline salt MgSO4·7H2O that is a hydrated magnesium sulfate with cathartic properties

called also bitter salts

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