Etymology
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Na

chemical symbol for sodium, from Latin natrium (see sodium).

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Definitions of Na

Na (n.)
a silvery soft waxy metallic element of the alkali metal group; occurs abundantly in natural compounds (especially in salt water); burns with a yellow flame and reacts violently in water; occurs in sea water and in the mineral halite (rock salt);
Synonyms: sodium / atomic number "
From wordnet.princeton.edu