Noun
- 1. calcium, Ca, atomic number 20, metallic element, metal
- usage: 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
- 2. California, Golden State, CA, Calif.
- usage: a state in the western United States on the Pacific; the 3rd largest state; known for earthquakes
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