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penta-sulphide
penta-sulphide n.
Brit. 
/ˌpɛntəˈsʌlfʌɪd/
, /ˌpɛntəˈsʌlfʌɪd/U.S. /ˌpɛn(t)əˈsəlˌfaɪd/
/ˌpɛn(t)əˈsəlˌfaɪd/ΚΠ
1849 D. Campbell Pract. Text-bk. Inorg. Chem. 311 Yellow precipitate, which is the pentasulphide of arsenic (sulpharsenic acid).
1910 Encycl. Brit. I. 147/2 Thiamides of the type R·CSNH2 are known, and result..by the action of phosphorus pentasulphide on the acid-amides.
1996 Philos. Trans. (Royal Soc.) A. 354 1600 The sulphur electrode consists of elemental sulphur impregnated in a carbon felt matrix. When discharge begins sodium pentasulphide is formed.
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