ferrous sulfateferrous sulfate
a green, crystalline compound, FeSO7HO, used in dyeing, the making of ink, etc.; copperas
A white to blue-green crystalline compound, FeSO4, occurring in nature as various hydrate minerals such as copperas, and used as a pigment, fertilizer, and feed additive, in sewage and water treatment, and as a medicine in the treatment of iron deficiency.
- (dated, inorganic chemistry) iron(II) sulfate