cal ‧ ci ‧ um /ˈkælsiəm/ BrE AmE noun [uncountable]
[ Date: 1800-1900 ; Language: Modern Latin ; Origin: Latin calx ; ⇨ ↑ chalk 1 ]
a silver-white metal that helps to form teeth, bones, and ↑ chalk . It is a chemical ↑ element : symbol Ca
cal ‧ ci ‧ um /ˈkælsiəm/ BrE AmE noun [uncountable]
[ Date: 1800-1900 ; Language: Modern Latin ; Origin: Latin calx ; ⇨ ↑ chalk 1 ]
a silver-white metal that helps to form teeth, bones, and ↑ chalk . It is a chemical ↑ element : symbol Ca
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012