thermoplastic
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Definitions
(noun) a material that softens when heated and hardens again when cooled. Synonyms: thermoplastic resin.
Noun Definition 1
(adj) having the property of softening or fusing when heated and of hardening and becoming rigid again when cooled. Synonyms: thermoplastic (vs. thermosetting). Example: "Thermoplastic materials can be remelted and cooled time after time without undergoing any appreciable chemical change."
Adjective Definition 1