English Reference
noun

breeder

n.
US /ˈbɹidɝ/ UK /bɹˈiːdɐ/ breed·er UK spelling breeders

  1. 01 B2 Upper Intermediate

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

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

    Simple

    The dog breeder showed us the puppies and their mother.

    In context

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

  2. 02 C2 Proficiency SlangInformal

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

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

    Simple

    The restaurant was crowded with breeders and their noisy toddlers.

    In context

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

    Teacher's tip

    This sense is highly informal and usually intended to be insulting to parents.

  3. 03 C1 Advanced Technical Science

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

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

    Simple

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

    In context

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

    breeder reactor

The teams have developed two open-access tools for scientists and plant breeders.

Phys.org· 11 Sept 2026

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.

This entry
Level B2 · Upper Intermediate
Frequency Frequent
Updated