| Subject | Estonian | English |
| environ. | kiire reaktor | 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 |
| chem. | kolonnijärgne reaktor | post-column reactor |
| gen. | kontrollitav reaktor | controlled reactor |
| chem. | liikumatu kihiga reaktor | fixed-bed reactor |
| chem. | vihmutatava kihiga reaktor | trickle-bed reactor |