[bahy-prod-uh kt]


a secondary or incidental product, as in a process of manufacture.
the result of another action, often unforeseen or unintended.

Origin of by-product

First recorded in 1900–05 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for byproduct

Contemporary Examples of byproduct

Historical Examples of byproduct

  • Or, to put it in other words, medival witchcraft was a byproduct of the civilisation of the Roman Empire.

    Irish Witchcraft and Demonology

    St. John D. (St. John Drelincourt) Seymour

  • The cook, although upset by my reference to kings, lost none of the dignity of serving the byproduct of the Alaska cod.

    The Flying Bo'sun

    Arthur Mason

  • Thus the initial stage in the making of clothes may have been a byproduct of the hunting habit.

    Man, Past and Present

    Agustus Henry Keane

  • Benzol from byproduct coking ovens also can be used, but quantitatively is totally inadequate.

  • A large part of decision is intuitive; it is the byproduct of the subconscious.

    The Armed Forces Officer

    U. S. Department of Defense

British Dictionary definitions for byproduct



a secondary or incidental product of a manufacturing process
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

Word Origin and History for byproduct



also byproduct; 1857, from by + product.

Online Etymology Dictionary, © 2010 Douglas Harper

byproduct in Science



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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.