| radicato | established |
| radicazione | rooting |
| Radicchiella | Dandelion |
| radice | source |
| radice a fittone | taproot |
| radice cubica | cube root |
| Radice digitale | Digital root |
| radice quadrata | square root |
| radici | roots |
| Radigost | Radegast |
| radio | radio |
| radio a galena | crystal set |
| radio a transistor | transistor radio |
| Radio America | A Prairie Home Companion |
| Radio Budapest | Magyar Rádió |
| Radio Cina Internazionale | China Radio International |
| Radio Corporation of America | RCA |
| Radio Days | Radio Days |
| Radio Europa Libera | Radio Free Europe |
| Radio Frequency IDentification | Radio-frequency identification |
| Radio Maria | Radio Maria |
| Radio Maryja | Radio Maryja |
| Radio Monte Carlo | Radio Monte Carlo |
| Radio sorgenti quasi stellari | Quasi stellar radio source |
| Radio Televizioni i Kosovës | Radio Television of Kosovo |
| Radio Vaticana | Vatican Radio |
| Radio-Activity | Radio-Activity |
| Radioantenne | Radio antennas |
| Radioassorbimento | Radio absorption |
| Radioastrometria | Radio astrometry |
| radioattività | radioactivity |
| radioattività naturale | natural radioactivity |
| radioattivo | radioactive |
| Radioburst | Radio burst |
| Radiochirurgia stereotassica | Stereotactic surgery |
| radiocommedia | radio play |
