| Adj. | 1. | thermosetting - having the property of becoming permanently hard and rigid when heated or cured; "the phenol resins and plastics were the original synthetic thermosetting materials" Synonyms: thermoset Antonyms: thermoplastic - having the property of softening or fusing when heated and of hardening and becoming rigid again when cooled; "thermoplastic materials can be remelted and cooled time after time without undergoing any appreciable chemical change" |
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