sodium chloride

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A colorless or white crystalline compound, NaCl, used in the manufacture of chemicals and as a food preservative and seasoning.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun inorganic chemistry Chemical term for common table salt, a compound composed of equal number of sodium and chlorine atoms. Chemical formula NaCl.

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

• noun a white crystalline solid consisting mainly of sodium chloride (NaCl)