noun Chemistry.
a sulfide whose molecules contain two or more atoms of sulfur.

1840–50; poly- + sulfide

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Encyclopedia Britannica


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.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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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
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.
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