noun Biology.
the mating of closely related individuals, as cousins, sire-daughter, brother-sister, or self-fertilized plants, which tends to increase the number of individuals that are homozygous for a trait and therefore increases the appearance of recessive traits.

1835–45; inbreed + -ing1 Unabridged


[in-breed, in-breed]
verb (used with object), inbred, inbreeding.
to breed (individuals of a closely related group) repeatedly.
to breed within; engender.
verb (used without object), inbred, inbreeding.
to engage in or undergo inbreeding.

1590–1600; in-1 + breed Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
inbreed (ˈɪnˈbriːd)
vb , -breeds, -breeding, -bred
1.  to breed from unions between closely related individuals, esp over several generations
2.  (tr) to develop within; engender
n, —adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

inbreeding in·breed·ing (ĭn'brē'dĭng)

  1. See homogamy.

  2. The continued breeding of closely related individuals so as to preserve desirable traits in a stock.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
inbreeding   (ĭn'brē'dĭng)  Pronunciation Key 
The breeding or mating of related individuals within an isolated or closed group of organisms or people. Inbreeding can result in inbreeding depression. However, in agriculture and animal husbandry, the continued breeding of closely related individuals can help to preserve desirable traits in a stock.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
There's not enough genetic disparity to ward off the perils of inbreeding.
Meanwhile, the wolves have shown a high incidence of a backbone malformation
  from inbreeding.
Inbreeding in the spirit of preserving the blood lines of nobility, or
  whatever, produces mental and physical deformity.
The inbreeding coefficient is, simply put, a measure of how inbred individuals
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