Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
polyester [pɔlɪˈɛstər] n (CHEM) сло́жный полиэфи́р; (fabric) полиэфи́рное волокно́
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.
Русский: