polyphenylene
/ˌpɒlɪˈfɛnɪliːn/Chemistry
noun
A polymer in which the repeating unit is or contains the para-phenylene group. Frequently attributive, especially in polyphenylene oxide noun a thermoplastic polymer whose repeating unit is the group —p-C6H4·O, which is used as a moulding material (abbreviated PPO).
Origin
1920s; earliest use found in Journal of the American Chemical Society. From poly- + phenylene.