By-product

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by-product

[′bī‚präd·əkt]
(engineering)
A product from a manufacturing process that is not considered the principal material.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

By-product

Material, other than the principal product, generated as a consequence of an industrial process or as a break-down product in a living system.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved