calcium
/ˈkælsi.əm/ · cal·ci·um
noun
- The chemical element (Symbol Ca), with an atomic number 20. Calcium is a soft, silvery-white alkaline earth metal.
- A soft, silvery-white alkaline earth metal which occurs naturally as carbonate in limestone and as silicate in many rocks. Calcium is found in limestone and many types of rocks.
noun
- An atom of this element. A single atom of calcium is a tiny particle.
Did you know? Calcium is essential for human health, particularly for bone development and density.