Etymology
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by-product (n.)

also byproduct, "secondary or additional product;" 1849, from by + product.

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Definitions of by-product

by-product (n.)
a secondary and sometimes unexpected consequence;
Synonyms: byproduct
by-product (n.)
a product made during the manufacture of something else;
Synonyms: byproduct / spin-off
From wordnet.princeton.edu

Dictionary entries near by-product

byline

by-name

BYOB

bypass

by-path

by-product

byre

by-road

Byronic

bystander

byte