| magnesium oxide n. A white powdery compound, MgO, having a high melting point (2,800°C), used in high-temperature refractories, electrical insulation, food packaging, cosmetics, and pharmaceuticals. |
magnesium oxide
n
(Chemistry / Elements & Compounds) 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
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| Noun | 1. |  magnesium oxide - a white solid mineral that occurs naturally as periclase; a source of magnesiumatomic number 12, magnesium, Mg - a light silver-white ductile bivalent metallic element; in pure form it burns with brilliant white flame; occurs naturally only in combination (as in magnesite and dolomite and carnallite and spinel and olivine) mineral - solid homogeneous inorganic substances occurring in nature having a definite chemical composition |
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