-bə(r)(z)- noun
also glauber salt
Usage: usually capitalized G
Etymology: after Johann R. Glauber died 1668
: the crystalline decahydrate Na 2 SO 4 .10H 2 O of sodium sulfate occurring naturally as mirabilite, obtained also from salt cake, and used chiefly in dyeing and in medicine as a laxative ; sometimes : anhydrous sodium sulfate — sometimes used in plural