1. polyester(n = noun.substance) - any of numerous synthetic resins; they are light and strong and weather resistant;
is a kind of synthetic resin
has particulars: polyester fiber
2. polyester(n = noun.substance) - a complex ester used for making fibers or resins or plastics or as a plasticizer;
is a kind of plastic, ester
3. polyester(n = noun.artifact) - any of a large class of synthetic fabrics;
is a kind of cloth, fabric, material, textile
has particulars: dacron, terylene
polyester, n. any of a group of condensation polymers used to form synthetic fibres such as Terylene or to make resins.