Syllable division and stress derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
pyrochemical is an adjective meaning "of or relating to or produced by chemical reactions at high temperatures". It carries one recorded sense.
of or relating to or produced by chemical reactions at high temperatures
Definitions, synonyms and semantic relations for pyrochemical come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.