Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
by-product is a noun meaning "a secondary and sometimes unexpected consequence". It carries 2 recorded senses.
a secondary and sometimes unexpected consequence
Definitions, synonyms and semantic relations for by-product come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.