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| a photon of penetrating electromagnetic radiation emitted from an atomic nucleus; electromagnetic radiation with wavelengths shorter than 1/10 of a nanometer |
| a unit of energy, the work done by a force of one newton when its point of application moves through a distance of one meter in the direction of the force |
| fast-breeder reactor | |
| —n | |
| breeder reactor See also fast reactor a nuclear reactor that uses little or no moderator and produces more fissionable material than it consumes | |
| fast-breeder reactor (fāst'brē'dər) Pronunciation Key
A breeder reactor that uses high-speed neutrons to produce fissionable material. See also nuclear reactor. |