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

Therefore, calcium citrate may be preferred over calcium carbonate in people with low stomach acid levels. —Trang Tran, Verywell Health, 5 Nov. 2025

Hu explained that the coral’s skeleton comprises millions of calcium carbonate particles called sclerites. —Georgina Jedikovska, Interesting Engineering, 27 Oct. 2025

The invertebrate animals develop a hard skeleton of calcium carbonate, which forms the structure of living reefs. —Evan Bush, NBC news, 23 Oct. 2025

Other alternatives, including calcium carbonate and alpha aluminum, are plentiful but more difficult to evenly disperse in the atmosphere due to their tendency to create clumps. —Tereza Pultarova, Space.com, 22 Oct. 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