noun, often attributive
cal·​ci·​um | \ ˈkal-sē-əm How to pronounce calcium (audio) \

Definition of calcium

: a silver-white divalent metallic element of the alkaline-earth group occurring only in combination — 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

Moringa — a tree that grows in hot, arid climates — has leaves that are dried and turned into a powder rich in calcium, vitamin A and protein. Florence Fabricant, New York Times, "Matcha Meets Its Match," 29 May 2018 All include vitamins and nutrients (such as calcium, iron, omega-3s, potassium, vitamin A and vitamin C) that are recommended for expecting and breastfeeding moms. Karla Walsh, Woman's Day, "The Best Breastfeeding Diet," 25 Feb. 2019 What Simich may not realize, though, is that while AstraZeneca has offices and facilities here in the U.S., the active ingredient for Crestor, rosuvastatin calcium, comes from abroad. David Lazarus,, "Where do prescription drugs come from? Good luck answering that question," 15 May 2018 Cooking in hot water rids the plant of its stinging hairs and creates a nutritious soup rich in vitamins A and C, as well as calcium. Sunset, "Top 10 Medicinal Plants You Can Grow at Home," 22 Jan. 2018 If that’s not possible, treatment with supplemental oxygen may be enough, the CDC says, along with drugs such as nifedipine, which acts on your body’s calcium to increase your access to blood and oxygen while easing some of the burden on your heart. Carolyn L. Todd, SELF, "What Exactly Is Altitude Sickness?," 20 Dec. 2018 This sugar is used, along with tiny amounts of minerals absorbed from the soil (such as nitrogen and calcium), to power the biological processes and build the body of the plant. Dan Gill,, "Northern exposure? Southern exposure? How compass directions can improve your plants' health," 31 Mar. 2018 Usually the nurses administer a version of the Myers Cocktail, a mix of B and C vitamins, potassium, magnesium, calcium, and amino acids delivered with an intravenous needle. Jamie Rosen, Town & Country, "Is the Wellness IV the Next Big Thing in Beauty?," 15 Aug. 2018 Think of it this way: Whole foods contain a natural package of health promoting substances, like calcium, magnesium, potassium and fiber (from fruits). Samantha Cassetty, NBC News, "What is healthier: natural sugar, table sugar or artificial sweeteners?," 6 Apr. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'calcium.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of calcium

1808, in the meaning defined above

History and Etymology for calcium

New Latin, from Latin calc-, calx lime

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Statistics for calcium

Last Updated

11 May 2019

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Time Traveler for calcium

The first known use of calcium was in 1808

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More Definitions for calcium



English Language Learners Definition of calcium

: a substance that is found in most plants and animals and that is especially important in people for strong healthy bones


cal·​ci·​um | \ ˈkal-sē-əm How to pronounce calcium (audio) \

Kids Definition of calcium

: a silvery soft metallic chemical element that is essential for strong healthy bones


noun, often attributive
cal·​ci·​um | \ ˈkal-sē-əm How to pronounce calcium (audio) \

Medical Definition of calcium

: 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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More from Merriam-Webster on calcium

Spanish Central: Translation of calcium

Nglish: Translation of calcium for Spanish Speakers

Britannica English: Translation of calcium for Arabic Speakers Encyclopedia article about calcium

Comments on calcium

What made you want to look up calcium? Please tell us where you read or heard it (including the quote, if possible).


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