[ pol-ee-es-ter, pol-ee-es-ter ]
/ ˈpɒl iˌɛs tər, ˌpɒl iˈɛs tər /


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.

Origin of polyester

First recorded in 1925–30; poly- + ester


pol·y·es·ter·i·fi·ca·tion [pol-ee-es-ter-uh-fi-key-shuhn], /ˌpɒl iˌɛs tər ə fɪˈkeɪ ʃən/, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for polyester

British Dictionary definitions for polyester

/ (ˌpɒlɪˈɛstə) /


any of a large class of synthetic materials that are polymers containing recurring -COO- groups: used as plastics, textile fibres, and adhesives
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for polyester

[ pŏlē-ĕs′tər ]

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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.