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Meaning of sodium polysulfide

so'dium polysul'fide

Pronunciation: [key]
— Chem. Chem.
  1. a yellow-brown, water-soluble, granular powder, NaS, used chiefly in the manufacture of sulfur dyes, insecticides, and synthetic rubber.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.