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
Vitamin D helps your body absorb calcium, supports muscle movement, and boosts immune function.
—
Stephanie Brown, Verywell Health, 28 Oct. 2025
Although rare, vitamin D toxicity can also lead to a buildup of calcium, or hypercalcemia.
—Sherri Gordon, Health, 28 Oct. 2025
The rain itself showed a photospheric signature (based on the silicon-to-sulfur ratio), while the hotter plasma around it had a coronal signature (based on calcium-to-argon).
—Pranjal Malewar, New Atlas, 27 Oct. 2025
By adding elements like titanium, magnesium and calcium, the glass becomes even tougher and stronger than steel.
—Kurt Knutsson, FOXNews.com, 23 Oct. 2025
See All Example Sentences for calcium
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Stephanie Brown, Verywell Health, 28 Oct. 2025
Although rare, vitamin D toxicity can also lead to a buildup of calcium, or hypercalcemia.
—Sherri Gordon, Health, 28 Oct. 2025
The rain itself showed a photospheric signature (based on the silicon-to-sulfur ratio), while the hotter plasma around it had a coronal signature (based on calcium-to-argon).
—Pranjal Malewar, New Atlas, 27 Oct. 2025
By adding elements like titanium, magnesium and calcium, the glass becomes even tougher and stronger than steel.
—Kurt Knutsson, FOXNews.com, 23 Oct. 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 3 Nov. 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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