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
For example, calcium and vitamin D are important for bone health.
—
Jennifer Lefton,
Verywell Health,
22 June 2026
The kidneys and glands, such as the parathyroid glands, produce hormones such as parathyroid hormone and vitamin D that act as signals to tell bone when to release calcium and phosphate into the bloodstream and when to store them.
—
Priya Bhardwaj,
The Conversation,
22 June 2026
Its namesake ingredient—mineral-rich deep-sea water sourced near Korea's Dokdo region—is naturally packed with skin-balancing minerals like magnesium and calcium.
—
Christa Joanna Lee,
Allure,
19 June 2026
Reducing the stiffness of the artery Help prevent calcium buildup in the arteries, which can make the arteries harder and less flexible.
—
Emmanuella Ogbonna,
Health,
18 June 2026
See All Example Sentences for calcium
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Jennifer Lefton,
Verywell Health,
22 June 2026
The kidneys and glands, such as the parathyroid glands, produce hormones such as parathyroid hormone and vitamin D that act as signals to tell bone when to release calcium and phosphate into the bloodstream and when to store them.
—
Priya Bhardwaj,
The Conversation,
22 June 2026
Its namesake ingredient—mineral-rich deep-sea water sourced near Korea's Dokdo region—is naturally packed with skin-balancing minerals like magnesium and calcium.
—
Christa Joanna Lee,
Allure,
19 June 2026
Reducing the stiffness of the artery Help prevent calcium buildup in the arteries, which can make the arteries harder and less flexible.
—
Emmanuella Ogbonna,
Health,
18 June 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 26 Jun. 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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