magnesium

noun

mag·​ne·​sium mag-ˈnē-zē-əm 

-zhəm

: a silver-white malleable ductile light metallic element that occurs abundantly in nature and is used in metallurgical and chemical processes, in photography, signaling, and pyrotechnics because of the intense white light it produces on burning, and in construction especially in the form of light alloys see Chemical Elements Table

Examples of magnesium in a Sentence

Recent Examples on the Web

For any condition, aim for no more than 300 mg of elemental magnesium daily unless your doctor advises otherwise. — Maggie O'Neill, Verywell Health, 4 Aug. 2026

The Hatchback fills the open rear section of the mouse’s magnesium frame, providing additional palm contact with more support and stability. — Mark Sparrow, Forbes.com, 2 Aug. 2026

To kickstart sweet, barrier-supporting dreams, try incorporating a magnesium supplement into your nightly routine, or use a topical form of the mineral, which is thought to promote more restful sleep. — Jenny Berg, Vogue, 31 July 2026

This fruit is a real nutritional powerhouse, brimming with vitamin C, vitamin A, folate, potassium, magnesium, and dietary fiber. — Su-Jit Lin, Better Homes & Gardens, 30 July 2026

Word History

Etymology

New Latin, from magnesia

First Known Use

1812, in the meaning defined above

Phrases Containing magnesium

• magnesium carbonate
• magnesium chloride
• magnesium hydroxide
• magnesium oxide
• magnesium sulfate

Rhymes for magnesium

• caesium
• cesium
• trapezium

Kids Definition

magnesium

noun

mag·​ne·​sium mag-ˈnē-zē-əm 

-zhəm

: a silver-white metallic element that is light and easily worked, burns with a dazzling light, and is used in making lightweight alloys see element

Medical Definition

magnesium

noun

mag·​ne·​sium mag-ˈnē-zē-əm  -zhəm 

: a silver-white light malleable ductile metallic element that occurs abundantly in nature (as in bones and seeds and in the form of chlorophyll in the green parts of plants) and is used in metallurgical and chemical processes, in photography, in signaling, and in the manufacture of pyrotechnics because of the intense white light it produces on burning, and in construction especially in the form of light alloys

—symbol Mg see Chemical Elements Table