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Definition of thermosetting adjective from the Oxford Advanced Learner's Dictionary

thermosetting

adjective
 
/ˈθɜːməʊsetɪŋ/
 
/ˈθɜːrməʊsetɪŋ/
(also thermoset)
(specialist)
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  1. (of plastics, polymers, etc.) that becomes permanently hard when it is heated

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