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
Orange and white Cheddar are both rich in protein, calcium, fat, and essential vitamins like A and B12.
—
Katie Rosenhouse, Southern Living, 1 June 2026
In response, Wave Texturizing Mist reimagines the ingredient altogether, opting instead for sea salt rich in magnesium, calcium, and potassium to create structure without brittleness.
—Conçetta Ciarlo, Vogue, 1 June 2026
Vitamin D helps your body absorb calcium, supports muscle movement, and boosts immune function.
—Stephanie Brown, Verywell Health, 1 June 2026
High phosphorous can lead to low calcium leading to breakdown of bone.
—Dr. John De Jong, Boston Herald, 31 May 2026
See All Example Sentences for calcium
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Katie Rosenhouse, Southern Living, 1 June 2026
In response, Wave Texturizing Mist reimagines the ingredient altogether, opting instead for sea salt rich in magnesium, calcium, and potassium to create structure without brittleness.
—Conçetta Ciarlo, Vogue, 1 June 2026
Vitamin D helps your body absorb calcium, supports muscle movement, and boosts immune function.
—Stephanie Brown, Verywell Health, 1 June 2026
High phosphorous can lead to low calcium leading to breakdown of bone.
—Dr. John De Jong, Boston Herald, 31 May 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 4 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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