| kainite | (n) a white mineral consisting of magnesium sulphate and potassium chloride; a source of potassium salts; used as a fertilizer |
| Kainite | n. [ Gr. &unr_; recent. ] (Min.) A compound salt consisting chiefly of potassium chloride and magnesium sulphate, occurring at the Stassfurt salt mines in Prussian Saxony. [ 1913 Webster ] |