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

Late-Night Spa: Wi Spa View this post on Instagram With the help of thousand-year-old minerals such as calcium, magnesium, iron, sodium and selenium, our salt sauna improves the physical, chemical and hydrodynamic conditions of the body. Taylore Glynn, Marie Claire, "The Must-Visit Spas & Salons in Los Angeles," 6 Sep. 2019 The water has a high pH value, along with calcium, magnesium and silica, a mix that can promote muscle and bone health and flush toxins from the body. William Thornton |, al, "Blue Spring Living Water is making a splash in Alabama," 11 Aug. 2019 That breathing test, along with others on their blood, calcium and iron levels, as well as bone density scans and exercise programs, are to be used to determine the women’s physical fitness. Fox News, "Military studying 'hyperfit' women who pass its toughest physical, mental courses," 22 July 2019 Most stones are a combination of calcium and either oxalate or phosphorous. Marcos Del Rosario-santiago,, "Doctors say summer is kidney-stone season. Here’s what you should know.," 11 July 2019 Folic acid also reduced the risk of stroke, while taking calcium and vitamin D together made strokes more likely. Arman Azad, CNN, "Supplements probably aren't helping your heart, research suggests," 8 July 2019 Fair Oaks is the flagship farm for Fairlife, a national brand of higher protein, higher calcium and lower fat milk. Suzanne Baker, Naperville Sun, "'Disturbing' video of calves being abused prompts Casey's Foods, Jewel to remove Fairlife dairy items," 5 June 2019 That breathing test, along with others on their blood, calcium and iron levels, as well as bone density scans and exercise programs will be used to determine the women's physical fitness. Lolita C. Baldor, Anchorage Daily News, "Military studies ‘hyperfit’ women who pass grueling courses," 23 Apr. 2019 Dairy milk contains high levels of calcium and vitamin D, which promote bone growth and strength and help prevent osteoporosis in older adults, according to the NIH. Carolyn L. Todd, SELF, "Is Sparkling Water Bad for You in Some Way?," 5 Apr. 2019

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.

See More

First Known Use of calcium

1808, in the meaning defined above

History and Etymology for calcium

New Latin, from Latin calc-, calx lime

Keep scrolling for more

Learn More about calcium

Statistics for calcium

Last Updated

14 Sep 2019

Look-up Popularity

Time Traveler for calcium

The first known use of calcium was in 1808

See more words from the same year

Keep scrolling for more

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

Keep scrolling for more

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).


recurring in steady succession

Get Word of the Day daily email!

Test Your Vocabulary

Musical Words Quiz

  • gramophone
  • Which word describes a musical performance marked by the absence of instrumental accompaniment?
True or False

Test your knowledge - and maybe learn something along the way.

Bee Cubed

Test Your Knowledge - and learn some interesting things along the way.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!