calcium
noun
cal·ci·um
ˈkal-sē-əm 
often attributive
: a metallic chemical element of the alkaline-earth group that occurs naturally only in combination and is essential to cellular functions in all known organisms see Chemical Elements Table
Examples of calcium in a Sentence
Her doctor said she should eat more foods that are high in calcium, such as milk and cheese.
Recent Examples on the Web
Cheese offers calcium for bone health.
—
Ashia Aubourg, Outside, 19 Feb. 2026
Made up mostly of calcium carbonate minerals, Roman travertine was formed hundreds of thousands of years ago by deposits of calcium, sulfur and other minerals, and shows the region's history of volcanic eruptions, forests and fossils in its striated layers.
—ABC News, 19 Feb. 2026
Chia Pudding Chia seeds are an excellent source of blood pressure-regulating nutrients, like fiber, calcium, and magnesium.
—Jillian Kubala, Health, 19 Feb. 2026
This scan, which insurance doesn't cover, usually is about $100 and looks at the amount of calcium in the arteries around your heart.
—Nicole Villalpando, Austin American Statesman, 18 Feb. 2026
See All Example Sentences for calcium
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Ashia Aubourg, Outside, 19 Feb. 2026
Made up mostly of calcium carbonate minerals, Roman travertine was formed hundreds of thousands of years ago by deposits of calcium, sulfur and other minerals, and shows the region's history of volcanic eruptions, forests and fossils in its striated layers.
—ABC News, 19 Feb. 2026
Chia Pudding Chia seeds are an excellent source of blood pressure-regulating nutrients, like fiber, calcium, and magnesium.
—Jillian Kubala, Health, 19 Feb. 2026
This scan, which insurance doesn't cover, usually is about $100 and looks at the amount of calcium in the arteries around your heart.
—Nicole Villalpando, Austin American Statesman, 18 Feb. 2026
See All Example Sentences for calcium
Cite this Entry
“Calcium.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/calcium. Accessed 22 Feb. 2026.
Copy CitationKids Definition
calcium
noun
cal·ci·um
ˈkal-sē-əm
: a silver-white soft metallic element that is found only in combination with other elements (as in limestone) and is one of the necessary elements making up the bodies of most plants and animals see element
Medical Definition
calcium
noun
cal·ci·um
ˈkal-sē-əm
often attributive
: a silver-white bivalent metallic element that is an alkaline earth metal, occurs only in combination, and is an essential constituent of most plants and animals
—symbol Ca
see Chemical Elements Table
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