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TOEFL BNC: 6256 COCA: 3783

sodium

noun
/ˈsəʊdiəm/
/ˈsəʊdiəm/
[uncountable]
(symbol Na)
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  1. a chemical element. Sodium is a soft silver-white metal that is found naturally only in compounds, such as salt.Topics Physics and chemistryc1
    Oxford Collocations DictionarySodium is used before these nouns:
    • salt
    See full entry
    Word Originearly 19th cent.: from soda + -ium.

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