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polysulphide

/ˌpɒlɪˈsʌlfaɪd/
noun
1.
any sulphide of a metal containing divalent anions in which there are chains of sulphur atoms, as in the polysulphides of sodium, Na2S2, Na2S3, Na2S4, etc
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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