[mag′nē·zē·əm pə′räk‚sīd] (inorganic chemistry) MgO2 A tasteless, odorless white powder; soluble in dilute acids, insoluble in water; a fire hazard; used as a bleaching and oxidizing agent, and in medicine.
magnesium peroxide
mag·ne·si·um pe·rox·ide
an ingredient in dentrifices and in antiseptic dusting powder; decomposes in water to hydrogen peroxide.