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Epsom salts

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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
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Epsom salts  
pl.n.   (used with a sing. verb)
Hydrated magnesium sulfate, MgSO4·7H2O, used as a cathartic and as an agent to reduce inflammation.

[After Epsom, former name of Epsom and Ewell, England.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

Epsom salts 
1770, obtained from Epsom water, the water of a mineral spring at Epsom in Surrey, England.
Online Etymology Dictionary, © 2001 Douglas Harper
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Medical Dictionary

Main Entry: Ep·som salt
Pronunciation: "ep-s&m-
Function: noun
: EPSOMSALTS

Main Entry: Epsom salts
Function: noun plural but singular in construction
: a bitter white crystalline salt MgSO4·7H2O that is a hydratedmagnesium sulfate with cathartic properties called also bitter salts
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Medical Dictionary

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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