: one that breeds: such as
a
: an animal or plant kept for propagation
b
: one engaged in the breeding of a specified organism
c
: a nuclear reactor designed to produce more fissionable material than it uses as fuel

called also breeder reactor

Examples of breeder in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
So breeders have relied on hybridization, crossing the American chestnut with the naturally resistant Asian chestnut by putting pollen from one into the flowers of the other. Steve Strauss, The Conversation, 22 July 2026 Purple City Genetics, a long-standing cannabis nursery, breeder and seed producer based in Oakland, set up a display of some of its most popular cloned plants, including the Moroccan Peaches and Bolinas strains. Camila Pedrosa, Sacbee.com, 19 July 2026 Turner still visits her childhood home regularly, where her parents, younger sister and another golden retriever named Brody — a distant relative of Sonny from the same Vermont breeder — continue to keep those memories alive. Tereza Shkurtaj, PEOPLE, 19 July 2026 Those looking for a responsible breeder can find them on Samoyed Club of America. Tanya Edwards, USA Today, 16 July 2026 See All Example Sentences for breeder

Word History

First Known Use

1529, in the meaning defined above

Time Traveler
The first known use of breeder was in 1529

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Cite this Entry

“Breeder.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/breeder. Accessed 28 Jul. 2026.

Medical Definition

breeder

noun
breed·​er
: one that breeds: as
a
: an animal or plant kept for propagation
b
: one engaged in the breeding of a specified organism

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