| Radioröhre | thermionic valve |
| Radiologe | radiologist |
| Radiologie | radiology |
| Radiosonde | radio altimeter |
| Nanoröhre | nanotube |
| Radierer | eraser |
| Radiographie | radiography |
| Radiolarie | radiolarian |
| Radiotaste | radio button |
| Radiator | radiator |
| Radiologin | radiologist |
| Radiowelle | radio wave radio station |
| Harnröhre | urethra |
| Radierung | etching |
| Radikale | radical |
| Radikaler | radical |
| Radiochemie | radiochemistry |
| Radioisotop | radioisotope |
| Radkralle | wheel clamp |
| radio- | radio- |