Longman Dictionary of Contemporary English homepage

by-product

 noun
     
Related topics: Industry
by-product also by‧prod‧uct [countable]
1TI 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.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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