Epsom salts

noun
🔊/ˈepsəm sɔːlts/
🔊/ˈepsəm sɔːlts/
[plural]
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  1. a white powder that can be mixed with water and used as a medicine or laxative泻盐
    Word Originmid 18th cent.: named after the town of Epsom, in Surrey, SE England, where it was first found occurring naturally.