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by-product

[bahy-prod-uh kt] /ˈbaɪˌprɒd əkt/
noun
1.
a secondary or incidental product, as in a process of manufacture.
2.
the result of another action, often unforeseen or unintended.
Origin
1900-1905
1900-05
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for by-product

by-product

noun
1.
a secondary or incidental product of a manufacturing process
2.
a side effect
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for by-product
n.

also byproduct; 1857, from by + product.

Online Etymology Dictionary, © 2010 Douglas Harper
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by-product in Science
by-product
  (bī'prŏd'əkt)   
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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7
7
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