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



BrE BrE//ˈsəʊdiəm//
; NAmE NAmE//ˈsoʊdiəm//
[uncountable](symbol Na)
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a chemical element. Sodium is a soft silver-white metal that is found naturally only in compounds, such as salt. Word Origin early 19th cent.: from soda + -ium.
See the Oxford Advanced American Dictionary entry: sodium