polysulfide

[pol-ee-suhl-fahyd]
noun Chemistry.
a sulfide whose molecules contain two or more atoms of sulfur.

Origin:
1840–50; poly- + sulfide

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To polysulfide
Encyclopedia Britannica
Encyclopedia

polysulfide

any member of a class of chemical compounds containing one or more groups of atoms of the element sulfur linked together by covalent bonds. In inorganic compounds belonging to this class, these groups are present as ions having the general formula Sn2-, in which n is a number from 3 to 10 or more; these compounds usually are prepared by dissolving sulfur in solutions containing the sulfide ion, S2-. Sodium polysulfides are used in the tanning industry to remove hair from hides; lime-sulfur and sulfurated potash, prepared by heating sulfur with lime and potash, respectively, are mixtures containing polysulfides, used as insecticides and pesticides.

Learn more about polysulfide with a free trial on Britannica.com.

Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
Cite This Source
Example sentences
Competing with silicone caulk are newer high-performance caulks: polysulfide,
  polyurethane, ethylene copolymer and others.
Fertilizers produced include calcium thiosulfate and ammonium polysulfide
  solutions.
Polysulfide electrolyte stable but gives low cell voltage.
Two-component polysulfide and polyurethane sealants show variable performance,
  require mixing and curing, and are rarely used.
Copyright © 2014 Dictionary.com, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature