calcium, Ca, atomic number 20 - a white metallic element that burns with a brilliant light; the fifth most abundant element in the earth's crust; an important component of most plants and animals --1is a kind ofmetallic element, metal --1is a substance of
California, Golden State, CA, Calif. - a state in the western United States on the Pacific; the 3rd largest state; known for earthquakes --2is a kind ofAmerican state --2is a part of