1570s, "one who produces or originates," agent noun from breed (v.). Meaning "one who breeds cattle" or some other animal is recorded from 1530s. Of nuclear reactors, from 1948. As a scornful homosexual term for "heterosexual person," attested from 1986.
A nuclear reactor that is used to create fissionable material (such as plutonium-239) by exposing nonfissionable material (such as uranium-238) to radiation. The source of the radiation is usually some other fissionable material. Breeder reactors produce more fissionable material than they use up.
Note: Breeder reactors are designed to produce more fuel than they consume.
Note: The development of the breeder reactor has been stopped in the United States, but continues to be pursued in Europe and Japan.
A heterosexual person; straight: the scornful term ''breeders,'' used by some urban gays about heterosexual couples with children (1980s+ Homosexuals)