sodium sulfide
nounDefinition of sodium sulfide
: 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