by-product ( synonym found)
Definition of by-product:

(n) : a secondary product; something made incidentally during the production of something else; a side effect
"the many Indian restaurants all over Britain are a by-product of the large waves of immigration from the subcontinent."
Definition of by-product:

(n) : a secondary product; something made incidentally during the production of something else; a side effect
"the many Indian restaurants all over Britain are a by-product of the large waves of immigration from the subcontinent."
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