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

Rather than loading up on sugar and additives, the recipe centers on compounds tied to winding down, including L-theanine, magnesium, lemon balm, chamomile and chicory root fiber. — Lauren Jarvis-Gibson july 17, Fort Worth Star-Telegram, 17 July 2026

In addition to potassium and magnesium, quinoa contains soluble and insoluble fiber, which supports digestion and directly affects blood pressure levels. — Eleesha Lockett, Verywell Health, 17 July 2026

The body is the typical basic black with a magnesium chassis and top plate, and a sculpted leatherette handgrip. — Jim Fisher, PC Magazine, 17 July 2026

Halle Berry has publicly discussed taking magnesium and creatine for brain fog. — Hanna Wickes, Miami Herald, 16 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