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
While too much calcium may contribute to kidney stone formation, adequate calcium intake can help prevent kidney stones and support overall health.2
What Foods Are High in Oxalic Acid?
Many nutritious foods contain oxalate.
—
Roxana Ehsani, Health, 21 May 2025
For more than two years, infusions of FOLFIRI, a combination of several drugs — folinic acid, also known as leucovorin, along with calcium folinate, fluorouracil, known as 5FU, and irinotecan — had somewhat controlled Elissa’s cancer growth.
—Kristen Jordan Shamus, USA Today, 19 May 2025
Veterinary hospital staff have begun providing Violeta UV light treatments and calcium supplements to help her recover.
—Clara Harter, Los Angeles Times, 17 May 2025
Like regular milk and other fortified dairy products, chocolate milk offers key nutrients for bone health, including calcium (which supports bone density) and vitamin D (which helps the body properly absorb calcium).456
3.
—Cristina Mutchler, Verywell Health, 14 May 2025
See All Example Sentences for calcium
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Roxana Ehsani, Health, 21 May 2025
For more than two years, infusions of FOLFIRI, a combination of several drugs — folinic acid, also known as leucovorin, along with calcium folinate, fluorouracil, known as 5FU, and irinotecan — had somewhat controlled Elissa’s cancer growth.
—Kristen Jordan Shamus, USA Today, 19 May 2025
Veterinary hospital staff have begun providing Violeta UV light treatments and calcium supplements to help her recover.
—Clara Harter, Los Angeles Times, 17 May 2025
Like regular milk and other fortified dairy products, chocolate milk offers key nutrients for bone health, including calcium (which supports bone density) and vitamin D (which helps the body properly absorb calcium).456
3.
—Cristina Mutchler, Verywell Health, 14 May 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 28 May. 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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