by-product

from WordNet (r) 3.0 (2006)

by-product
    n 1: a secondary and sometimes unexpected consequence [syn: {by-
         product}, {byproduct}]
    2: a product made during the manufacture of something else [syn:
       {by-product}, {byproduct}, {spin-off}]

from The Collaborative International Dictionary of English v.0.48

By-product \By"-prod`uct\, n.
   A secondary or additional product; something produced, as in
   the course of a manufacture, in addition to the principal
   product.
   [1913 Webster]

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