Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A soft, light, extremely malleable silver-white metallic element that reacts explosively with water, is naturally abundant in combined forms, especially in common salt, and is used in the production of a wide variety of industrially important compounds. Atomic number 11; atomic weight 22.99; melting point 97.8°C; boiling point 892°C; specific gravity 0.971; valence 1. See Table at element.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A soft, waxy, silvery reactive metal that is never found unbound in nature, and a chemical element (symbol Na) with an atomic number of 11 and atomic weight of 22.98977.

from the GNU version of the Collaborative International Dictionary of English

  • n. 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.

from The Century Dictionary and Cyclopedia

  • n. Chemical symbol, Na (natrium); atomic weight, 23. The metallic base of the alkali soda. See soda and metallurgy

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • 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)

Etymologies

sod(a) + -ium.
(American Heritage® Dictionary of the English Language, Fourth Edition)
Coined by Humphry Davy in 1807, from soda. (Wiktionary)

Examples

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