calcium carbonate

American  

noun

1. a white, crystalline, water-insoluble, tasteless powder, CaCO 3 , occurring in nature in various forms, as calcite, chalk, and limestone: used chiefly in dentifrices and polishes and in the manufacture of lime and cement.

---

calcium carbonate British  

noun

1. a white crystalline salt occurring in limestone, chalk, marble, calcite, coral, and pearl: used in the production of lime and cement. Formula: CaCO 3

---

calcium carbonate Scientific  

1. A white or colorless crystalline compound occurring naturally in chalk, limestone, and marble and in the minerals calcite and aragonite. It is used to make toothpaste, white paint, and cleaning powder. Chemical formula: CaCO ₃ .

---

Etymology

Origin of calcium carbonate

First recorded in 1870–75

Example Sentences

More interesting for Bott than the climate benefit is the way calcium carbonate makes water more alkaline.

From The Wall Street Journal • May 14, 2026

The authors call for urgent efforts to measure how much calcium carbonate each plankton group produces, dissolves, and exports to deeper waters.

From Science Daily • Feb. 8, 2026

Some of these animals can photosynthesize like plants; some harvest algae and seawater to make calcium carbonate for their underwater castles; some produce their own light or glow in the dark.

From The Wall Street Journal • Nov. 21, 2025

Every year, they generate more than 1.5 billion tonnes of calcium carbonate, capturing carbon dioxide from the atmosphere and storing it in deep-sea sediments.

From Science Daily • Oct. 10, 2025

“Oh, stuff like magnesium salts, and alcohol for keeping the Deltas and Epsilons small and backward, and calcium carbonate for bones, and all that sort of thing.”

From "Brave New World" by Aldous Huxley