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

Magnesium supplements are available in many forms, like magnesium oxide, chloride, and sulfate.2 Magnesium citrate is the most effective form for muscle pain because the body can absorb and break down magnesium citrate better than other forms. —Kirstyn Hill, Pharmd, Mph, Health, 30 Apr. 2025

Magnesium is also available in different salt forms, such as magnesium oxide, glycinate, and citrate. —Emmanuella Ogbonna, Health, 10 Apr. 2025

For example, magnesium oxide is common but not effectively absorbed by the body.8 Magnesium citrate, glycinate, and malate have higher solubility and bioavailability that allow for better absorption. —Nick Blackmer, Verywell Health, 11 Apr. 2025

In another test, wet samples of calcium silicate and magnesium oxide were simply exposed to air. —New Atlas, 2 Mar. 2025

Word History

First Known Use

1866, in the meaning defined above

Rhymes for magnesium oxide

• acetaldehyde
• acetanilide
• arabinoside
• cycloheximide
• cyclophosphamide
• diethylamide
• dinucleotide
• ferricyanide
• ferrocyanide
• glutaraldehyde
• glyceraldehyde
• hydroperoxide

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