| refrigerante | refrigerant |
| refrigerare | cool down |
| Refrigeratore a diluizione | Dilution refrigerator |
| refrigerazione | refrigeration |
| refrigerio | refreshment |
| refurtiva | boodle |
| Refusenik | Refusenik |
| refuso | corrigendum |
| Reg Parnell | Reg Parnell |
| regalare | gift |
| regalato | dirt-cheap |
| regale | regal |
| Regalecus glesne | King of herrings |
| Regaliano | Regalianus |
| regalità | kingship |
| regalo | present |
