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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