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

The ionized calcium test is more precise and is often used when the total calcium levels are abnormal or when conditions affecting calcium balance are suspected.1 These tests can help healthcare providers learn more about the calcium status in the body. —Sarah Jividen, Health, 28 Nov. 2024

As evidence, readers may recall an earlier op-ed of mine this year about how, because of my family history, my doctor recommended a calcium test that measures arterial plaque buildup, despite my apparent good health. —David McGrath, Chicago Tribune, 28 Nov. 2024

Three tablespoons of hemp seeds, for example, contain a satisfying 9 grams of protein, plus impressive amounts of calcium, phosphorus, and potassium. —Angela Haupt, TIME, 25 Nov. 2024

Almond butter is higher in fiber, vitamin E (good for the immune system), magnesium (good sleep), iron, and calcium. —Margaux Anbouba, Vogue, 24 Nov. 2024

Word History

Etymology

New Latin, from Latin calc-, calx lime

First Known Use

1808, in the meaning defined above

Phrases Containing calcium

• calcium carbide
• calcium carbonate
• calcium channel blocker
• calcium chloride
• calcium citrate
• calcium cyanamide
• calcium gluconate
• calcium hydroxide
• calcium hypochlorite
• calcium oxalate
• calcium oxide
• calcium phosphate
• calcium silicate
• calcium sulfate

Kids 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

Etymology

derived from Latin calc-, calx "lime" — related to calculate, chalk

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