Magnesium Oxide

**Definition:** Magnesium oxide (MgO). An inorganic compound that occurs in nature as the mineral periclase. In aqueous media combines quickly with water to form magnesium hydroxide. It is used as an antacid and mild laxative and has many nonmedicinal uses.

**Tree numbers:** - D01.524.490 - D01.650.550.575

**Synonyms:** - Magnesia