A classification for materials that can be made soft by the application of heat and harden upon cooling.
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ther·mo·plas·tic .thər-mə-'plas-tik adj capable of softening or fusing when heated and of hardening again when cooled <\thermoplastic synthetic resins>
thermoplastic n a thermoplastic material
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ther·mo·plas·tic (thur″mo-plasґtik) softening under heat and capable of being molded into shape with pressure, then hardening on cooling without undergoing chemical change.Medical dictionary. 2011.