noun
: a crystalline salt ZnSO 4 that is usually obtained by reaction of sulfuric acid with zinc, zinc oxide, or a roasted zinc ore, that normally crystallizes from solutions as the efflorescent heptahydrate occurring also as the mineral goslarite, and that is used chiefly in coagulating baths for viscose rayon, in fertilizers and sprays, in making lithopone and other zinc chemicals, in dyeing and printing, in flotation, and in medicine as an astringent and emetic