| radioaktiver Staub | fallout |
| radioaktiver Abfall | radioactive waste |
| radioaktiver Zerfall | radioactive decay |
| Radioaktivität | radioactivity |
| radioaktiv | radioactive |
| Adjektivstamm | adjective stem |
| affirmativer Satz | affirmative |
| negativer Satz | negative clause |
| positiver Satz | affirmative sentence |
| Direktverkauf | outlet |
| Richterstab | judge's staff judge's wand |
| Prädikativum | predicative |
| Radio Eriwan | Radio Yerevan |
| Radiotaste | radio button |
| Radikalismus | radicalism |
| Radioapparat | radio receiver |
| Radioastronomie | radio astronomy |
| Radiointerview | radio interview |
| Radiometer | radiometer |
| Radioteleskop | radio telescope |