(physics) The major stable isotope of magnesium, ²⁴₁₂Mg, having twelve protons and twelve neutrons; it amounts to about 79% of the element in nature

(physics) A minor stable isotope of magnesium, ²⁵₁₂Mg, having twelve protons and thirteen neutrons; it amounts to about 10% of the element in nature

(chemistry) A fine white powder, MgO₂, used as a bleach and disinfectant

(chemistry) The magnesium salt of lactic acid; sometimes used as a buffer of a food additive

(inorganic chemistry) The base Mg(OH)₂ that occurs naturally as brucite; it is used as an antacid and in many industrial processes

(inorganic chemistry) The magnesium salt of hydrochloric acid, MgCl₂; it has many industrial applications including the electrolytic production of magnesium metal.

(inorganic chemistry) The magnesium salt of carbonic acid, MgCO₃; it is a white powdery solid that occurs as magnesite and other minerals; it used as a mild base and in numerous industrial applications

plural of magnesium sulfate

(inorganic chemistry) A white, crystalline powder (when pure), usually found in an impure, brown, non-crystalline form.

Alternative spelling of magnesium sulfide