| radiodiffusione | broadcasting |
| Radiodiffusione pubblica | Public broadcasting |
| radiodiffuso | broadcast |
| Radiodisturbo | Interference |
| radioelemento | radioelement |
| Radioeliografi | Radioheliographs |
| Radiofaro | Electric beacon |
| radiofarom | radio beacon |
| radiofrequenza | radio frequency |
| Radiogalassia | Radio galaxy |
| Radiogalassie | Radio galaxy |
| Radiogalassie giganti | Giant radio galaxies |
| radiografare | X-ray |
| radiografia | X-ray |
| Radiografia convenzionale | X-ray |
