[ out-breed ]
/ ˌaʊtˈbrid /

verb (used with object), out·bred, out·breed·ing.

to breed selected individuals outside the limits of the breed or variety.

Origin of outbreed

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for outbreeding

  • Outbreeding (unless too far out) develops vigor at the expense of the characteristic traits.

    Folkways|William Graham Sumner
  • 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

British Dictionary definitions for outbreeding


/ (ˌaʊtˈbriːd) /

verb -breeds, -breeding or -bred

(intr) 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

Science definitions for outbreeding


[ outbrē′dĭng ]

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.
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