noun, often attributive
cal·ci·um | \ ˈkal-sē-əm \

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

After the water receded, the remnant exoskeletons turned into land that is packed with calcium. Angela Fritz, Washington Post, "The prehistoric shoreline of the Gulf of Mexico is so fertile you can see it from space," 12 July 2018 So far, Totsch has tried Mojo Hydration's athletic recovery cocktail three times — a mix of vitamin B complex, amino acids, calcium and glutathione, an antioxidant found in plants. Zahria Rogers, The Courier-Journal, "Concierge IV hydration therapy service seeks to rehydrate Louisville," 12 July 2018 Other bowls will be made with the acai berry, said to be high in antioxidants, fiber and calcium. Kenneth R. Gosselin,, "UConn Campus At Hartford's Front Street Gets First Retail Leases," 26 June 2018 Gourmet Grubb says Entomilk has a high protein content and is rich in iron, zinc, and calcium. Caitlin O'kane, CBS News, "Is cockroach milk back as a superfood trend?," 26 May 2018 Nutrition: Choose a product that is fortified with calcium and vitamin D. Almond and coconut milk have almost no protein so if looking for a protein boost, pea protein milks or soy and to a lesser extent oatmeal would be a better choice. Sheah Rarback, miamiherald, "Lots of choices for milk substitutes, but beware of sugar content | Miami Herald," 24 May 2018 Yet another found that calcium might damage the heart. NBC News, "Vitamin supplements don't lower cardiovascular risk, study finds," 10 July 2018 Now the notion that calcium protects against colon polyps also has been upended. Joe Graedon, M.s. And Teresa Graedon, Ph.d., charlotteobserver, "The pros and cons of calcium supplements | Charlotte Observer," 14 Mar. 2018 The bone density scan uses X-ray technology to measure a person’s bone mass (measuring the calcium in grams per centimeter squared in the bone). Milwaukee Journal Sentinel, "Osteoporosis is not a normal part of aging," 22 May 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.

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 2018

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 \

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 \

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).


alleviating pain or harshness

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?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

Add Diction

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!