Meaning of calcium carbonate

cal'cium car'bonate

Pronunciation: [key]
  1. a white, crystalline, water-insoluble, tasteless powder, CaCO, 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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.