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 bacteria are able to convert urea — which the bacteria produce as waste — and calcium into calcium carbonate crystals.
—
Keith Cooper, Space.com, 6 Apr. 2025
All of these potential complications show why, in addition to liver function tests, abnormal bone X-rays and calcium or cholesterol levels in the blood often are the initial clues that there’s an A problem.
—Bruce Y. Lee, Forbes.com, 5 Apr. 2025
The mineral binds to calcium inside the tiny holes caused by bacterial acid, helping to fill them; this makes teeth just a bit more resistant to acid.
—Megha Satyanarayana, Scientific American, 4 Apr. 2025
The yogurt is made with whole milk, providing kids with essential nutrients like calcium and vitamins A and D, which can be lost when fat is removed from dairy, explains Lebovitz.
—Sherri Gordon, Clc, Parents, 2 Apr. 2025
See All Example Sentences for calcium
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Keith Cooper, Space.com, 6 Apr. 2025
All of these potential complications show why, in addition to liver function tests, abnormal bone X-rays and calcium or cholesterol levels in the blood often are the initial clues that there’s an A problem.
—Bruce Y. Lee, Forbes.com, 5 Apr. 2025
The mineral binds to calcium inside the tiny holes caused by bacterial acid, helping to fill them; this makes teeth just a bit more resistant to acid.
—Megha Satyanarayana, Scientific American, 4 Apr. 2025
The yogurt is made with whole milk, providing kids with essential nutrients like calcium and vitamins A and D, which can be lost when fat is removed from dairy, explains Lebovitz.
—Sherri Gordon, Clc, Parents, 2 Apr. 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 16 Apr. 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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