Kain :: Kain (n.) Poultry, etc., required by the lease to be paid in kind by a tenant to his landlord..
Kainit :: Kainit (n.) Salts of potassium used in the manufacture of fertilizers.
Kainite :: Kainite (n.) A compound salt consisting chiefly of potassium chloride and magnesium sulphate, occurring at the Stassfurt salt mines in Prussian Saxony..