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sesquisulphuret
sesquisulphuret n.
Brit. 
/ˌsɛskwᵻˈsʌlf(j)ᵿrɛt/
, /ˌsɛskwᵻˈsʌlf(j)ᵿrɛt/U.S. /ˌsɛskwəˈsəlf(j)əˌrɛt/
/ˌsɛskwəˈsəlf(j)əˌrɛt/ΚΠ
1825 T. Thomson Attempt to Establish First Princ. Chem. II. App. 515 Sesquisulphuret of arsenic.
1890 Westm. Gaz. 1 Mar. 6/1 It has been found that sesqui-sulphuret of phosphorus..melts only at 142 deg.
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