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

Research shows that sardines are an inexpensive source of omega-3s and other heart-healthy nutrients like calcium, potassium, and magnesium. —Stephanie Brown, Verywell Health, 10 Oct. 2025

That’s where magnesium body sprays are supposed to come in handy. —Audrey Noble, Vogue, 10 Oct. 2025

Some nuts and seeds are higher in magnesium than others and are smart choices for those looking to boost their intake. —Jillian Kubala, Health, 8 Oct. 2025

Infused with vitamin B12, vitamin C, magnesium and amino acids, this preservative-free formula is gentle on sensitive eyes and helps keep them comfortable and protected. —Adam Mills, MSNBC Newsweek, 8 Oct. 2025

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