calcium

باللغة العربية: كَلْسِيُوم، كَالْسِيُوم

1. The chemical element (symbol Ca) with atomic number 20: a soft, silvery-white alkaline earth metal which occurs naturally as carbonate in limestone and as silicate in many rocks. (countable, uncountable)
2. An atom of this element. (countable)

الجمع calciums