breeder

UK: /ˈbriːdə^r/ US: /ˈbridɚ/ ,(brē′dər)

WordReference Random House Learner's Dictionary of American English © 2026

breed•er /ˈbridɚ/   n. [countable]

1. Genetics an animal, plant, or person that produces young.
2. Genetics a person who raises animals or plants for breeding.
3. Physics, Energy Also called ˈbreed•er reˌac•tor. a nuclear reactor in which more material is produced than is used up.

WordReference Random House Unabridged Dictionary of American English © 2026

breed•er  (brē′dər), n. 

1. an animal, plant, or person that produces offspring or reproduces.
2. a person who raises animals or plants primarily for breeding purposes.
3. Physics, Energy Also called breed′er reac′tor. [Energy.] a nuclear reactor in which more fissile material is produced than is consumed.

• breed + -er¹ 1525–35

Collins Concise English Dictionary © HarperCollins Publishers::

breeder / ˈbriːdə/ noun

1. a person who breeds plants or animals
2. something that reproduces, esp to excess
3. an animal kept for breeding purposes
4. a source or cause: a breeder of discontent
5. short for breeder reactor
6. a heterosexual person