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Epsom salt

noun
1.
Often, Epsom salts. Chemistry, Pharmacology. hydrated magnesium sulfate, MgSO 4 ⋅7H 2 O, occurring as small colorless crystals: used in fertilizers, the dyeing of fabrics, leather tanning, etc., and in medicine chiefly as a cathartic.
Origin
1760-1770
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. 2014.
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British Dictionary definitions for epsom salts

Epsom salts

noun
1.
(functioning as singular or pl) a medicinal preparation of hydrated magnesium sulphate, used as a purgative
Word Origin
C18: named after Epsom, where they occur naturally in the water
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for epsom salts
Epsom salts
1770, obtained from Epsom water, the water of a mineral spring at Epsom in Surrey, England. The place name is recorded c.973 as Ebbesham, lit. "Ebbi's homestead," from the name of some forgotten Anglo-Saxon.
Online Etymology Dictionary, © 2010 Douglas Harper
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epsom salts in Medicine

Epsom salts Ep·som salts (ěp'səm)
pl.n.
Hydrated magnesium sulfate, used as a cathartic and as an agent to reduce inflammation.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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epsom salts in Science
Epsom salts
  (ěp'səm)   
A bitter, colorless, crystalline salt, used in making textiles, in fertilizers, for medical purposes, and as an additive to bath water to soothe the skin. Chemical formula: MgSO4·7H2O.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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