What is "magnesium peroxide"

n. (context chemistry English) A fine white powder, MgO₂, used as a bleach and disinfectant

Magnesium peroxide (MgO) is an odorless fine powder peroxide with a white to off-white color. It is similar to calcium peroxide because magnesium peroxide also releases oxygen by breaking down at a controlled rate with water. Commercially, magnesium peroxide often exists as a compound of magnesium peroxide and magnesium hydroxide.