magnesium oxide

noun

: a white highly infusible compound MgO used especially in refractories, cements, insulation, and fertilizers, in rubber manufacture, and in medicine as an antacid and mild laxative

Examples of magnesium oxide in a Sentence

Recent Examples on the Web

Some health experts suggest magnesium supplementation can help prevent migraine attacks, with magnesium oxide being the most popular type for migraine treatment. —Ashley Wong, Health, 10 Dec. 2024

Poor bioavailability means that your body may not fully absorb magnesium oxide supplements.6 4. —Brittany Lubeck, Ms, Rdn, Verywell Health, 20 Nov. 2024

Airborne features magnesium in the forms of magnesium oxide and magnesium sulfate, while Emergen-C uses magnesium hydroxide and magnesium carbonate. —Megan Nunn, Verywell Health, 10 Oct. 2024

There are wallboards with much better water resistance, such as cement board or magnesium oxide board. —Jamie Gold, Forbes, 8 Oct. 2024

Word History

First Known Use

1866, in the meaning defined above

Kids Definition

magnesium oxide

noun

: a white earthy solid that consists of magnesium and oxygen and is used especially in fertilizers and rubber, as a mild laxative, and against acid in the stomach

Medical Definition

magnesium oxide

noun

: a white highly infusible compound MgO used especially in refractories, cements, insulation, and fertilizers, in rubber manufacture, and in medicine as an antacid and mild laxative