| Subject | Portuguese | English |
| R&D., nucl.phys. | Comité de Coordenação dos Reactores Rápidos | Fast Reactors Coordinating Committee |
| R&D., nucl.phys. | Comité de Coordenação dos Reactores Rápidos | Coordinating Committee on Fast Reactors |
| environ. | reactores biológicos | bioreactor A container, such as a large fermentation chamber, for growing living organisms that are used in the industrial production of substances such as pharmaceuticals, antibodies, or vaccines |
| environ. | reactores nucleares | nuclear reactor |
| environ. | reactores nucleares | nuclear reactor Device which creates heat and energy by starting and controlling atomic fission |
| nucl.phys. | reactores nucleares de potência com neutrões térmicos | nuclear power reactors on thermal neutrons |
| environ. | reactores rápidos | fast reactor Nuclear reactor which produces more fissile material than it consumes, using fast-moving neutrons and making plutonium-239 from uranium-238, thereby increasing the reactor's efficiency |