magnesium oxide

noun Chemistry.

1. magnesia.

noun

1. 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: MgOAlso called: magnesia

n.

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