- of, containing, or like calcium carbonate; chalky: calcareous earth.
- of, containing, or resembling calcium carbonate; chalky
also calcarious, 1670s, from Latin calcarius “of lime,” from calx (genitive calcis) “lime, limestone” (see chalk (n.)).
- Composed of, containing, or characteristic of calcium carbonate, calcium, or limestone; chalky.
- Composed of or containing calcium or calcium carbonate. Calcareous rocks contain as much as 50 percent calcium carbonate.