Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
oxidation-reduction is a noun meaning "a reversible chemical reaction in which one reaction is an oxidation and the reverse is a reduction". It carries one recorded sense.
a reversible chemical reaction in which one reaction is an oxidation and the reverse is a reduction
Definitions, synonyms and semantic relations for oxidation-reduction come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.