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 II 2, sodium hydrosulfide, sodium polysulfide

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Chem.

a yellow or brick-red, crystalline, deliquescent, water-soluble solid, Na₂S, used chiefly in the manufacture of dyes, soaps, and rubber, as a depilatory for leather, and in the flotation of powdered lead and copper ores.