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
Perimenopausal women also need to get plenty of calcium, magnesium, and zinc to protect bone health from disruptive estrogen fluctuations, says Moon.
—
Emma Loewe, Outside, 1 Jan. 2026
Minerals like calcium and magnesium can cling to the surface over time, especially in areas with high water hardness.
—Daley Quinn, Southern Living, 1 Jan. 2026
Broccoli brings the fiber, tofu brings the protein, and both supply a good deal of calcium.
—Riley Wofford, Martha Stewart, 31 Dec. 2025
Hummus offers more protein and calcium, as well as less fat, than guacamole.
—Heather Jones, Verywell Health, 31 Dec. 2025
See All Example Sentences for calcium
Examples are automatically compiled from online sources to
show current usage.
Read More
Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
Send us feedback.
Emma Loewe, Outside, 1 Jan. 2026
Minerals like calcium and magnesium can cling to the surface over time, especially in areas with high water hardness.
—Daley Quinn, Southern Living, 1 Jan. 2026
Broccoli brings the fiber, tofu brings the protein, and both supply a good deal of calcium.
—Riley Wofford, Martha Stewart, 31 Dec. 2025
Hummus offers more protein and calcium, as well as less fat, than guacamole.
—Heather Jones, Verywell Health, 31 Dec. 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 Jan. 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
Love words? Need even more definitions?
Merriam-Webster unabridged
Share