Epsom salts
plural noun
1- crystals of hydrated magnesium sulphate used as a purgative or for other medicinal use泻盐, 七水合硫酸镁。
1.1
- Chem. formula: MgSO4·7H2O.化学分子式：MgSO4·7H2O.
词源
mid 18th cent.: named after the town of EPSOM, where it was first found occurring naturally.