thermoplastic
noun(ther-mo-plas-tic)
a material that softens when heated and hardens again when cooled
Synonyms: thermoplastic resin,
thermoplastic
(ther-mo-plas-tic)
having the property of softening or fusing when heated and of hardening and becoming rigid again when cooled
Examples:
Thermoplastic materials can be remelted and cooled time after time without undergoing any appreciable chemical change.