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Epsom salt

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noun
  1. Often Epsom salts. Chemistry, Pharmacology. hydrated magnesium sulfate, MgSO4⋅7H2O, occurring as small colorless crystals: used in fertilizers, the dyeing of fabrics, leather tanning, etc., and in medicine chiefly as a cathartic.

Origin of Epsom salt

1760–70; after Epsom; so called from its presence in the local mineral water
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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