ˈby-ˌproduct BrE AmE , by‧prod‧uct /ˈbaɪˌprɒdʌkt $ -ˌprɑː-/ noun [countable]
1 . something additional that is produced during a natural or industrial process
by-product of
a by-product of oil refining
2 . an unplanned additional result of something that you do
by-product of
Job losses are an unfortunate byproduct of the recession.
⇨ ↑ end product