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phosphorus sesquisulfide

[ses-kwi-suhl-fahyd]
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noun
  1. (not in scientific use) a yellow, crystalline, flammable substance, P4S3, insoluble in cold water and decomposed by hot water: used chiefly in organic synthesis and in the manufacture of matches.
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Origin of phosphorus sesquisulfide

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018