: 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

breeder tulip

2 of 2

noun (2)

variants or less commonly breeder
plural -s
: any of certain self-colored late-flowering tulips that resemble Darwin tulips but lack the rectangular flower base and are commonly somewhat more somber in coloring

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.
Noun
The court order comes after the breeder already voluntarily surrendered more than 800 chinchillas to animal welfare organizations. — CBS News, 4 Nov. 2026 Mahan knows many of the breeders and buyers personally and isn’t afraid to needle them to keep the bidding going. — Dana O’Neil, CNN Money, 30 Oct. 2026 Every win traces back to a farm in this state and a breeder who matched a mare with a stallion, then waited years to see the result reach the track. — Tk Kuegler, Baltimore Sun, 29 Oct. 2026 Plant breeders have been working for decades to develop new varieties for ever-shrinking gardens. — Kim Toscano, Southern Living, 29 Oct. 2026 See All Example Sentences for breeder

Word History

First Known Use

Noun (1)

1529, in the meaning defined above

Time Traveler
The first known use of breeder was in 1529

Browse Nearby Words

Cite this Entry

“Breeder.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/breeder. Accessed 14 Nov. 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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