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[out-breed] /ˌaʊtˈbrid/
verb (used with object), outbred, outbreeding.
to breed selected individuals outside the limits of the breed or variety.
Origin of outbreed Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for outbreeding
Historical Examples
  • If so, there would be a school in which the advantages of outbreeding would appear as a fact, although not explained.

    Folkways William Graham Sumner
  • outbreeding (unless too far out) develops vigor at the expense of the characteristic traits.

    Folkways William Graham Sumner
  • The due adjustment of inbreeding and outbreeding is always a difficult problem of policy for breeders of animals.

    Folkways William Graham Sumner
British Dictionary definitions for outbreeding


verb -breeds, -breeding, -bred
(intransitive) (anthropol) to produce offspring through sexual relations outside a particular family or tribe
to breed (animals that are not closely related) or (of such animals) to be bred
Derived Forms
outbreeding, noun
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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outbreeding in Science
The mating or breeding of distantly related or unrelated individuals. Outbreeding often produces offspring of superior quality because it increases homozygosity (the occurrence of two alleles for the same trait at corresponding positions on homologous chromosomes), thereby sharply reducing the risk of deleterious recessive genes being expressed. Crossbreeding is the most common form of outbreeding.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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