thermoplastic

Adjective
  1. Having the property of softening or fusing when heated and of hardening and becoming rigid again when cooled (synset 302418645)
    "thermoplastic materials can be remelted and cooled time after time without undergoing any appreciable chemical change"
Noun
  1. A material that softens when heated and hardens again when cooled (synset 114617524)

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