Definition of Epsom salts noun from the Oxford Advanced Learner's Dictionary

 

Epsom salts

 noun
noun
BrE BrE//ˌepsəm ˈsɔːlts//
 
; NAmE NAmE//ˌepsəm ˈsɔːlts//
 
[plural]
 
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a white powder that can be mixed with water and used as a medicine or laxative Word Origin mid 18th cent.: named after the town of Epsom, in Surrey, SE England, where it was first found occurring naturally.
See the Oxford Advanced American Dictionary entry: Epsom salts