| Radiosonde | radio altimeter |
| Radiosender | radio broadcaster radio network station |
| Radiologe | radiologist |
| Radiologie | radiology |
| Radioröhre | thermionic valve |
| Fadensonde | telltale |
| Raumsonde | space probe |
| Radioisotop | radioisotope |
| Radiolarie | radiolarian |
| Radiotaste | radio button |
| Radikand | radicand |
| Radiologin | radiologist |
| Radiowelle | radio wave radio station |
| Madison | Madison |
| Robinsonade | robinsonade |
| Dösende | dozer |
| Reisende | traveler traveller |
| Radierung | etching |
| Radikale | radical |
| Radiochemie | radiochemistry |