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
Whole Grains Whole grains offer plenty of fiber and magnesium.
—
Lana Barhum, Verywell Health, 5 Dec. 2025
According to Jessica Brantley-Lopez, MBA, RDN, vitamin D helps the gut transport magnesium from food and supplements more efficiently, while magnesium increases vitamin D absorption.
—Sarah Garone, Health, 3 Dec. 2025
Yellowing orchid leaves are frequently caused by a lack of magnesium, an essential element for photosynthesis.
—Leanne Potts, Better Homes & Gardens, 29 Nov. 2025
Right, so the battery uses gelatin as the electrolyte, and magnesium and molybdenum as electrodes – both of which are relatively benign elements and can safely degrade in soil.
—Abhimanyu Ghoshal, New Atlas, 28 Nov. 2025
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Lana Barhum, Verywell Health, 5 Dec. 2025
According to Jessica Brantley-Lopez, MBA, RDN, vitamin D helps the gut transport magnesium from food and supplements more efficiently, while magnesium increases vitamin D absorption.
—Sarah Garone, Health, 3 Dec. 2025
Yellowing orchid leaves are frequently caused by a lack of magnesium, an essential element for photosynthesis.
—Leanne Potts, Better Homes & Gardens, 29 Nov. 2025
Right, so the battery uses gelatin as the electrolyte, and magnesium and molybdenum as electrodes – both of which are relatively benign elements and can safely degrade in soil.
—Abhimanyu Ghoshal, New Atlas, 28 Nov. 2025
See All Example Sentences for magnesium
Cite this Entry
“Magnesium.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/magnesium. Accessed 9 Dec. 2025.
Copy CitationKids 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
-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
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