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Definitions for sodium:

The Collaborative International Dictionary of English v.0.48 :
Sodium \So"di*um\, n. [NL., fr.E. soda.] (Chem.) A common metallic element of the alkali group, in nature always occuring combined, as in common salt, in albite, etc. It is isolated as a soft, waxy, white, unstable metal, so highly reactive that it combines violently with water, and to be preserved must be kept under petroleum or some similar liquid. Sodium is used combined in many salts, in the free state as a reducer, and as a means of obtaining other metals (as magnesium and aluminium) is an important commercial product. Symbol Na (Natrium). Atomic weight 22.990. Specific gravity 0.97. [1913 Webster] Sodium amalgam, an alloy of sodium and mercury, usually produced as a gray metallic crystalline substance, which is used as a reducing agent, and otherwise. Sodium carbonate, a white crystalline substance, Na2CO3.10H2O, having a cooling alkaline taste, found in the ashes of many plants, and produced artifically in large quantities from common salt. It is used in making soap, glass, paper, etc., and as alkaline agent in many chemical industries. Called also sal soda, {washing soda}, or soda. Cf. Sodium bicarbonate, and Trona. Sodium chloride, common, or table, salt, NaCl. Sodium hydroxide, a white opaque brittle solid, NaOH, having a fibrous structure, produced by the action of quicklime, or of calcium hydrate (milk of lime), on sodium carbonate. It is a strong alkali, and is used in the manufacture of soap, in making wood pulp for paper, etc. Called also sodium hydrate, and caustic soda. By extension, a solution of sodium hydroxide. [1913 Webster]

The Collaborative International Dictionary of English v.0.48 :
Natrium \Na"tri*um\, n. [NL. See Natron.] (Chem.) The technical name for sodium. [1913 Webster]

WordNet (r) 2.0 :
sodium 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) [syn: Na, atomic number 11]

Elements database 20001107 :
sodium Symbol: Na Atomic number: 11 Atomic weight: 22.9898 Soft silvery reactive element belonging to group 1 of the periodic table (alkali metals). It is highly reactive, oxidizing in air and reacting violently with water, forcing it to be kept under oil. It was first isolated by Humphrey Davy in 1807.

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Sodium - Wikipedia, the free encyclopedia
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sodium: Definition from Answers.com
sodium n. ( Symbol Na ) A soft, light, extremely malleable silver-white metallic element that reacts explosively with water, is naturally abundant

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Sodium chloride - Wikipedia, the free encyclopedia
Sodium chloride, also known as common salt, table salt, or halite, is a chemical ... Sodium chloride is used in other chemical processes for the large-scale ...

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