- Rabbia... to Raillietiniasis...
- Railroad... to Reactive...
- Rebound... to Redness...
- Reduced... to Reimann...
- Reinsertion... to Resistance...
- Resorption... to Reticulosarcoma...
- Reticulosis... to Retropharyngeal...
- Retroplacental... to Rhinodacryolith...
- Rhinolalia... to Rickets...
- Rickettsial... to RIND...
- Ring... to Rokitansky...
- Rokitansky... to Röteln...
- Rubeola... to Rytand...