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.

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