glauber’s salt

noun

1. the decahydrate form of sodium sulfate, a colorless, crystalline, water-soluble solid, Na2SO4·10H2O, used chiefly in textile dyeing and as a cathartic.

noun

1. the crystalline decahydrate of sodium sulphate

n.

1. A colorless hydrated sodium sulfate used as a cathartic and diuretic.