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

Developed by Damien Cavallucci’s Cavcorp, the Luminare is centered around TotalFusion, Australia’s largest premium wellness club, offering residents access to magnesium spas, Finnish saunas, flotation tanks, a hypoxic altitude chamber, and hyperbaric oxygen therapy. —Abby Montanez, Robb Report, 25 Feb. 2026

Half a cup of cooked lentils contains almost 9 grams of protein and 8 grams of fiber, while also providing folate, potassium, magnesium, zinc, and iron. —Jenna Anderson, Health, 25 Feb. 2026

Almonds, chestnuts, walnuts, hazelnuts, chia, and flax are rich in magnesium and omega-3s, helping to support nervous-system and hormonal balance. —Mélanie Defouilloy, Vogue, 24 Feb. 2026

Compared to coffee, hot chocolate is a much better source of magnesium. —Sarah Bence, Verywell Health, 23 Feb. 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