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 fruit also contains smaller amounts of other nutrients, such as calcium and several B vitamins.
—
Jillian Kubala, Health, 16 Sep. 2025
Tempeh has more protein, fiber, and iron per serving compared to tofu, but tofu is lower in calories and contains a higher calcium content.
—Angelica Bottaro, Verywell Health, 16 Sep. 2025
The dating technique used on the eggs, known more formally as carbonate uranium-lead, or U-Pb, dating, is a common process for determining the age of carbonate minerals — those containing calcium, iron, manganese and magnesium.
—Mindy Weisberger, CNN Money, 12 Sep. 2025
Enhance Soil Fertility Rely on the soil sample analysis to determine the levels of phosphorus, potassium, calcium, magnesium, zinc, manganese, and boron in your soil.
—Mary Marlowe Leverette, Southern Living, 10 Sep. 2025
See All Example Sentences for calcium
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Jillian Kubala, Health, 16 Sep. 2025
Tempeh has more protein, fiber, and iron per serving compared to tofu, but tofu is lower in calories and contains a higher calcium content.
—Angelica Bottaro, Verywell Health, 16 Sep. 2025
The dating technique used on the eggs, known more formally as carbonate uranium-lead, or U-Pb, dating, is a common process for determining the age of carbonate minerals — those containing calcium, iron, manganese and magnesium.
—Mindy Weisberger, CNN Money, 12 Sep. 2025
Enhance Soil Fertility Rely on the soil sample analysis to determine the levels of phosphorus, potassium, calcium, magnesium, zinc, manganese, and boron in your soil.
—Mary Marlowe Leverette, Southern Living, 10 Sep. 2025
See All Example Sentences for calcium
Cite this Entry
“Calcium.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/calcium. Accessed 18 Sep. 2025.
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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