polyether
/ˌpɒlɪˈiːθə/noun
Any of a variety of polymers in which the repeating unit contains an ether linkage, C—O—C, many of which are used commercially, especially as plastic foams and epoxy resins. Frequently attributive, especially in polyether foam.
Origin
1920s; earliest use found in Chemical Abstracts. From poly- + ether.