Longman Dictionary of Contemporary English homepage

Date: 1700-1800
Origin: Epsom, town in southern England with a supply of water in which the substance was found

Epsom salts

 noun
     
Related topics: Drugs, Medicines
Ep‧som salts [plural]
MD a white powder that can be mixed with water and used as a medicine
Definition from the Longman Dictionary of Contemporary English
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