Etymology
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polyester (n.)

1929, "a polymer in which the units are joined by the ester linkage," formed from polymer + ester. Man-made polyester fiber was discovered in 1941.

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Definitions of polyester

polyester (n.)
any of numerous synthetic resins; they are light and strong and weather resistant;
polyester (n.)
a complex ester used for making fibers or resins or plastics or as a plasticizer;
polyester (n.)
any of a large class of synthetic fabrics;
From wordnet.princeton.edu