Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
thermoset is an adjective meaning "having the property of becoming permanently hard and rigid when heated or cured". It carries one recorded sense.
having the property of becoming permanently hard and rigid when heated or cured
“the phenol resins and plastics were the original synthetic thermosetting materials”
Definitions, synonyms and semantic relations for thermoset come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.