a chemical element. Calcium is a soft silver-white metal that is found in bones, teeth and chalk. Topics Physics and chemistryb2钙 Oxford Collocations DictionaryCalcium is used before these nouns:- concentration
- deficiency
- deposit
- …
Word Originearly 19th cent.: from Latin calx, calc- ‘lime’, probably from Greek khalix ‘pebble, limestone’ + -ium.