phosphorus sesquisulfide

American

[ses-kwi-suhl-fahyd] / ˌsɛs kwɪˈsʌl faɪd /

noun

(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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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023