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

Which high-protein breakfast, magnesium supplement, or skincare trend is best and why? —Mykenna Maniece, Vogue, 19 Mar. 2026

Research suggests that certain nutrients — including tryptophan, magnesium and melatonin — are involved in regulating the body's sleep-wake cycle, although experts emphasize that overall dietary patterns matter more than any single food. —Peter Burke, FOXNews.com, 18 Mar. 2026

Pumpkin seeds contain more protein and essential minerals than almonds, including magnesium, zinc, iron, and phosphorus. —Carley Millhone, Health, 16 Mar. 2026

The symptoms of a magnesium deficiency include fatigue, lethargy, nausea, loss of appetite, and muscle weakness. —Maggie O'Neill, Verywell Health, 16 Mar. 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