by-product

[bahy-prod-uhkt]
noun
1.
a secondary or incidental product, as in a process of manufacture.
2.
the result of another action, often unforeseen or unintended.

Origin:
1900–05

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
by-product
 
n
1.  a secondary or incidental product of a manufacturing process
2.  a side effect

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Science Dictionary
by-product   (bī'prŏd'əkt)  Pronunciation Key 
Something produced in the process of making something else. When plants produce carbohydrates by photosynthesis, oxygen is released as a by-product. Asphalt and paraffin are by-products of the process of refining crude oil into gasoline.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences for byproducts
The jets are byproducts of accretion they carry away excessive angular momentum.
Many are also attracted to ethanol, one of the byproducts of decaying trees.
And byproducts are sweet honeylike syrup and creamy sugar for desserts.
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