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phosphorus sesquisulfide

[ses-kwi-suhl-fahyd] /ˌsɛs kwɪˈsʌl faɪd/
noun
1.
(not in scientific use) a yellow, crystalline, flammable substance, P 4 S 3 , insoluble in cold water and decomposed by hot water: used chiefly in organic synthesis and in the manufacture of matches.
Origin
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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