Epsom salt

Epsom salt

noun
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:
1760–70; after Epsom; so called from its presence in the local mineral water
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Epsom salt is always a great word to know.
So is melamine. Does it mean:
rapid oxidation accompanied by heat and light, or a chemical combination attended by production of heat and light
a white, crystalline, slightly water-soluble solid, C3N3(NH2)3, used chiefly in organic synthesis and in the manufacture of resins
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