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
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Olivine is a mineral primarily found in igneous rocks (rocks created through the solidification and crystallization of molten rock) that are rich in magnesium and iron.
—
Lydia Mansel, Travel + Leisure, 26 Dec. 2025
These magnesium atoms facilitate intercage connections via C–C single bonds and [2+2] cycloaddition.
—Aman Tripathi, Interesting Engineering, 25 Dec. 2025
This is likely due to heart-healthy monounsaturated fats and minerals, such as magnesium and potassium.
—Lana Barhum, Verywell Health, 23 Dec. 2025
The vitamin is commonly included in electrolytes, but look out for magnesium glycinate for the most bioavailable form.
—Ellie Davis, Vogue, 23 Dec. 2025
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Lydia Mansel, Travel + Leisure, 26 Dec. 2025
These magnesium atoms facilitate intercage connections via C–C single bonds and [2+2] cycloaddition.
—Aman Tripathi, Interesting Engineering, 25 Dec. 2025
This is likely due to heart-healthy monounsaturated fats and minerals, such as magnesium and potassium.
—Lana Barhum, Verywell Health, 23 Dec. 2025
The vitamin is commonly included in electrolytes, but look out for magnesium glycinate for the most bioavailable form.
—Ellie Davis, Vogue, 23 Dec. 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 1 Jan. 2026.
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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