noun, Chemistry.
a white tasteless substance occurring naturally as periclase: used as an antacid and laxative and in refractory materials, such as crucibles and fire bricks. Formula: MgO Also called magnesia

magnesium oxide n.
A white powdery compound having a high melting point (2,800°C), used in food packaging, cosmetics, and pharmaceuticals.


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  • Magnesium-peroxide

    noun, Chemistry. 1. a white, tasteless, water-insoluble powder, MgO 2 , used as an antiseptic and as an oxidizing and bleaching agent.

  • Magnesium salicylate

    magnesium salicylate n. A sodium-free salicylate derivative with anti-inflammatory, analgesic, and antipyretic actions, used for relief of mild to moderate pain.

  • Magnesium-silicate

    noun, Chemistry. 1. a white powder, 3MgSiO 3 ⋅5H 2 O, with variable hydration, insoluble in water or alcohol, used as a rubber filler, a bleaching agent, an odor absorbent, and in the manufacture of paints and resins. 2. any silicate containing magnesium, as enstatite, talc, or magnesium trisilicate.

  • Magnesium-sulfate

    noun, Chemistry. 1. a white, water-soluble salt, MgSO 4 , used chiefly in medicine and in the processing of leather and textiles. magnesium sulfate n. A colorless crystalline compound used as a cathartic and applied locally as an anti-inflammatory agent.

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