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calcium

noun
🔊/ˈkælsiəm/
🔊/ˈkælsiəm/
 [uncountable]
(symbol Ca)
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  1. a chemical element. Calcium is a soft silver-white metal that is found in bones, teeth and chalk.钙Topics Physics and chemistryb2
    Oxford Collocations DictionaryCalcium is used before these nouns:
    • concentration
    • deficiency
    • deposit
    • …
    See full entry
    Word Originearly 19th cent.: from Latin calx, calc- ‘lime’, probably from Greek khalix ‘pebble, limestone’ + -ium.