English Reference

Word

breeder

Phoneticsbreed·er, stress on the first syllable

US/ˈbɹidɝ/

UK/bɹˈiːdɐ/

Definitions

01animal/plant professional

B2 · Upper Intermediate Countable noun

n. a person who raises animals or plants to produce new ones with specific qualities.

n. a person who practices the controlled propagation of animals or plants, typically to maintain or improve specific genetic traits.

“The dog breeder showed us the puppies and their mother.”

“The award-winning rose breeder spent decades cross-pollinating different varieties to achieve that specific shade of deep violet.”

Synonyms

02a parent

C2 · Proficiency Countable noun Slang · Informal

n. a rude way to describe a person who has children or is very focused on their kids.

n. a derogatory term for a parent, typically used to imply that their life is entirely consumed by child-rearing.

“The restaurant was crowded with breeders and their noisy toddlers.”

“The online forum was notorious for its hostile attitude toward parents, frequently referring to them as breeders.”

Synonyms

03nuclear reactor

C1 · Advanced Countable noun Science Technical

n. a type of nuclear reactor that makes more fuel than it uses.

n. a nuclear reactor that produces more fissile material than it consumes, typically by converting fertile isotopes into fissile ones.

“The government invested in a new breeder to improve energy efficiency.”

“The experimental breeder was designed to utilize uranium-238 more effectively than conventional light-water reactors.”

Synonyms

breeder reactor

Real-World Examples

“Because most plant breeders haven't focused on root systems in the past, "we don't really know what the real trade-off is," Busch said.”
Phys.org 18 Sept 2026
“The teams have developed two open-access tools for scientists and plant breeders.”
Phys.org 11 Sept 2026

Etymology

From breed + -er. Cognate with West Frisian brieder (“one who breeds, breeder”), Dutch broeier (“brooder, vagrant”).

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

Word family

Related words

This entry

Exam level
CambridgeCambridgeCambridge English QualificationsThe exam suite from Cambridge University Press & Assessment, from A1 Movers up to C2 Proficiency. The benchmark names double as CEFR labels.B2 FirstIELTSIELTSInternational English Language Testing SystemThe 0–9 band test co-owned by the British Council, IDP, and Cambridge. Used for university entry, work, and migration.5.5–6.5TOEFL iBTTOEFL iBTTest of English as a Foreign Language, Internet-Based TestETS's academic English test, the standard route for US university admissions. Scored 0–120, with a 1–6 scale since 2026.1–6 scale: 4.0–4.572–94TOEICTOEICTest of English for International CommunicationETS's workplace English test, big in Japan and Korea. Listening & Reading scores 10–990 and tops out at C1.785–944
Frequency
Frequent
Level
B2 · Upper Intermediate
Updated

QR code

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English Reference