say it: pah-lee-EH-stur
polyester is a noun meaning "any of numerous synthetic resins; they are light and strong and weather resistant". It carries 3 recorded senses.
any of numerous synthetic resins; they are light and strong and weather resistant
any of a large class of synthetic fabrics
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for polyester come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.