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
The sediments also contained elevated calcium, calcite, and sulfur signatures linked to microorganisms adapted to warmer environments.
—
Kaif Shaikh, Interesting Engineering, 25 May 2026
Minerals like calcium and magnesium can cling to the surface over time, especially in areas with high water hardness.
—Daley Quinn, Southern Living, 25 May 2026
Specifically, Goodson notes that fermentation can enhance the absorption of nutrients like B vitamins and minerals such as calcium and iron that aren’t always easily absorbed in their original form.
—Daryl Austin, USA Today, 23 May 2026
Mushrooms, when grown under ultraviolet (UV) light, can be a good source of vitamin D, which is essential to your ability to use calcium to build strong bones.
—Nancy Lebrun, Verywell Health, 22 May 2026
See All Example Sentences for calcium
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Kaif Shaikh, Interesting Engineering, 25 May 2026
Minerals like calcium and magnesium can cling to the surface over time, especially in areas with high water hardness.
—Daley Quinn, Southern Living, 25 May 2026
Specifically, Goodson notes that fermentation can enhance the absorption of nutrients like B vitamins and minerals such as calcium and iron that aren’t always easily absorbed in their original form.
—Daryl Austin, USA Today, 23 May 2026
Mushrooms, when grown under ultraviolet (UV) light, can be a good source of vitamin D, which is essential to your ability to use calcium to build strong bones.
—Nancy Lebrun, Verywell Health, 22 May 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 29 May. 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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