Definition of phosphorus heptasulfide
: a yellow crystalline compound P4S7 made by heating a mixture of phosphorus and sulfur in a ratio of about 4 to 7 equivalents, regarded formerly as a trisulfide, and used chiefly in the synthesis of organic sulfur compounds (as thiophene); tetra-phosphorus heptasulfide
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Origin and Etymology of phosphorus heptasulfide
heptasulfide from hepta- + sulfide
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