Definition of calcium noun from the Oxford Advanced Learner's Dictionary

 

calcium

 noun
noun
BrE BrE//ˈkælsiəm//
 
; NAmE NAmE//ˈkælsiəm//
 
[uncountable](symbol Ca)
 
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a chemical element. Calcium is a soft silver-white metal that is found in bones, teeth and chalk. Word Origin early 19th cent.: from Latin calx, calc- ‘lime’, probably from Greek khalix ‘pebble, limestone’ + -ium.
See the Oxford Advanced American Dictionary entry: calcium

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