[pol-ee-es-ter, pol-ee-es-ter]
Chemistry. a polymer in which the monomer units are linked together by the group –COO–, usually formed by polymerizing a polyhydric alcohol with a polybasic acid: used chiefly in the manufacture of resins, plastics, and textile fibers.
Also called poly. a fabric made from such textile fibers.

1925–30; poly- + ester

polyesterification [pol-ee-es-ter-uh-fi-key-shuhn] , noun
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World English Dictionary
polyester (ˌpɒlɪˈɛstə)
any of a large class of synthetic materials that are polymers containing recurring -COO- groups: used as plastics, textile fibres, and adhesives

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Word Origin & History

1929, formed from poly(mer) + ester. Polyester fiber was discovered 1941.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
polyester   (pŏl'ē-ěs'tər)  Pronunciation Key 
Any of various mostly synthetic polymers that are light, strong resins resistant to weather and corrosion. Polyesters are long chains of esters and are used to make fibers and plastics. They are thermosetting. Some polyesters, such as suberin, occur naturally.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Avoid plastic shutters and blinds, as well as polyester fabrics that won't
The combination of cotton and polyester is often the culprit behind static
In the seventies, he would sometimes wear a red polyester jumpsuit and a gold
  chain to meetings with bankers.
The polyester sutures break down into biocompatible compounds that do not cause
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