polysulphide
/ˌpɒlɪˈsʌlfaɪd/( <美> polysulfide)
noun
1- Chemistry a compound containing two or more sulphur atoms bonded together as an anion or group【化】多硫化物。
1.1
- a synthetic rubber or other polymer in which the units are linked through such groups硫合橡胶。