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
Taking a calcium supplement or eating a calcium-heavy meal alongside iron can cut iron absorption by up to 50%, which is why nutritionists suggest separating the two by at least two hours.
—
Allison Palmer
updated June 13, Sacbee.com, 13 June 2026
Excessive carbon dioxide can lock away too much calcium and disrupt beneficial reactions.
—Aamir Khollam, Interesting Engineering, 12 June 2026
Magnesium helps regulate heart rhythm by supporting the movement of calcium and potassium across cell membranes, Lindsay-Adler said.
—Mira Miller, Verywell Health, 12 June 2026
Sardines, however, provide significantly higher levels of nutrients per serving, among them omega-3 fatty acids, selenium, vitamin B12, plus calcium if eating bone-in options (totally safe to eat, as the canning process softens them to the texture of very al dente pasta).
—Rebecca Firkser, Bon Appetit Magazine, 11 June 2026
See All Example Sentences for calcium
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Allison Palmer
updated June 13, Sacbee.com, 13 June 2026
Excessive carbon dioxide can lock away too much calcium and disrupt beneficial reactions.
—Aamir Khollam, Interesting Engineering, 12 June 2026
Magnesium helps regulate heart rhythm by supporting the movement of calcium and potassium across cell membranes, Lindsay-Adler said.
—Mira Miller, Verywell Health, 12 June 2026
Sardines, however, provide significantly higher levels of nutrients per serving, among them omega-3 fatty acids, selenium, vitamin B12, plus calcium if eating bone-in options (totally safe to eat, as the canning process softens them to the texture of very al dente pasta).
—Rebecca Firkser, Bon Appetit Magazine, 11 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 18 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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