sodium sulfide
noun
: a sulfide of sodium
especially
: a crystalline compound Na2S usually obtained by heating sodium sulfate with coal or hydrogen and used in dehairing hides, in the manufacture of sulfur dyes, as a solvent for these dyes, and as a reducing agent for the nitro group in making amines compare black ash entry 2 sense 2, sodium hydrosulfide, sodium polysulfide
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Merriam-Webster unabridged
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