an animal, plant, or person that produces offspring or reproduces.
a person who raises animals or plants primarily for breeding purposes.
Also called breeder reactor. Energy. a nuclear reactor in which more fissile material is produced than is consumed.

1525–35; breed + -er1

nonbreeder, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
breeder (ˈbriːdə)
1.  a person who breeds plants or animals
2.  something that reproduces, esp to excess: rabbits are persistent breeders
3.  an animal kept for breeding purposes
4.  a source or cause: a breeder of discontent
5.  short for breeder reactor

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1570s, "one who produces or originates," agent noun from breed (v.). Meaning "one who breeds cattle" or some other animal is recorded from 1530s. Of nuclear reactors, from 1948. As a scornful homosexual term for "heterosexual person," attested from 1986.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
He hoped to find some new method of making a living and aspired to become a
  professional breeder of ferrets.
Unless you go to breeder reactors, you are going to run into shortages if the
  world turns heavily to nuclear.
It was stated that breeder reactors have not been accepted because of
  proliferation concerns.
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