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

Some common nutritional supplements include zinc for immune function, ashwagandha for stress relief, fish oil for improving heart health and magnesium for better sleep, among others that have gained popularity on social media. — Angelica Stabile, FOXNews.com, 21 Oct. 2026

Deepkold offers Focus and Energy pouches with 50 mg caffeine and 50 mg L-theanine, a caffeine-free Shroom Frost built around lion’s mane, cordyceps, reishi and B12, and Deep Calm for sleep with melatonin, L-theanine and magnesium glycinate. — Hanna Wickes, Kansas City Star, 20 Oct. 2026

The right combination of nutrients (think magnesium, tryptophan, and complex carbohydrates) can actually steady blood sugar through the night, nudging the body towards better melatonin and serotonin production. — Patsy Anthony, Vogue, 19 Oct. 2026

Key Takeaways B vitamins, magnesium, iron, vitamin D, CoQ10, creatine, and vitamin C all play different roles in the processes that keep your body functioning and producing energy. — Sara Hoffman, Verywell Health, 16 Oct. 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