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thermoplastic

[thur-muh-plas-tik] /ˌθɜr məˈplæs tɪk/
adjective
1.
soft and pliable when heated, as some plastics, without any change of the inherent properties.
noun
2.
a plastic of this type.
Origin
1880-1885
1880-85; thermo- + plastic
Related forms
thermoplasticity
[thur-moh-pla-stis-i-tee] /ˌθɜr moʊ plæˈstɪs ɪ ti/ (Show IPA),
noun
nonthermoplastic, adjective, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for thermoplastics

thermoplastic

/ˌθɜːməʊˈplæstɪk/
adjective
1.
(of a material, esp a synthetic plastic or resin) becoming soft when heated and rehardening on cooling without appreciable change of properties Compare thermosetting
noun
2.
a synthetic plastic or resin, such as polystyrene, with these properties
Derived Forms
thermoplasticity (ˌθɜːməʊplæˈstɪsɪtɪ) noun
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
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Word Origin and History for thermoplastics

thermoplastic

adj.

1883, see thermo- + plastic. As a noun from 1929.

Online Etymology Dictionary, © 2010 Douglas Harper
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thermoplastics in Science
thermoplastic
  (thûr'mə-plās'tĭk)   
Of or relating to a compound that can be repeatedly made soft and hard through heating and cooling. Polyethylene and polystyrene are thermoplastic resins. Compare thermosetting.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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