calcium carbonate

noun

: a compound CaCO₃ found in nature as calcite and aragonite and in plant ashes, bones, and shells and used especially in making lime and Portland cement and as a gastric antacid

Examples of calcium carbonate in a Sentence

Recent Examples on the Web

The bacteria are able to convert urea — which the bacteria produce as waste — and calcium into calcium carbonate crystals. —Keith Cooper, Space.com, 6 Apr. 2025

The calcium carbonate deposit rate could partially describe expansion, and the distance between polyps was crucial to simulating cloning. —Quanta Magazine, 26 Feb. 2025

The two most common forms of supplemental calcium are calcium citrate and calcium carbonate. —Jonathan Purtell, Verywell Health, 19 Jan. 2025

When water evaporates from a still-hot, nearly empty kettle, remaining calcium and magnesium crystallize into calcium carbonate (not to be confused with sodium bicarbonate, a.k.a. —Emily Farris, Bon Appétit, 25 Mar. 2025

Word History

First Known Use

1868, in the meaning defined above

Rhymes for calcium carbonate

• borosilicate
• decontaminate
• deoxycholate
• deteriorate
• differentiate
• diisocyanate
• dinoflagellate
• excommunicate
• incapacitate
• insubordinate
• intercorporate
• interpenetrate

Kids Definition

calcium carbonate

noun

: a solid substance found in nature as limestone and marble and in plant ashes, bones, and shells and used especially in making lime and portland cement

Medical Definition

calcium carbonate

noun

: a calcium salt CaCO₃ that is found in limestone, chalk, marble, plant ashes, bones, and many shells, that is obtained also as a white precipitate by passing carbon dioxide into a suspension of calcium hydroxide in water, and that is used in dentifrices and in pharmaceuticals as an antacid and to supplement bodily calcium stores