ˈepsəm- noun plural but usually singular in construction
( or epsom salt )
Usage: usually capitalized E
Etymology: from Epsom, England
: a bitter colorless or white crystalline salt consisting of magnesium sulfate heptahydrate MgSO 4 .7H 2 O, having cathartic qualities, and used especially in medicine and in the leather and textile industries (as in dyeing and finishing)