Chem., Pharm.
a bluish-green, crystalline, saline-tasting, water-soluble heptahydrated solid, FeSO 4 ·7H 2 O, used chiefly in the manufacture of other iron salts, in water purification, fertilizer, inks, pigments, tanning, photography, and in medicine in the treatment of anemia. Also called copperas, green vitriol, iron vitriol, iron sulfate .
[ 1860-65 ]