retraction ring - RPET
- rice grain medium
- rice polish
- rice polishings
- rice rat
- rice-Tween agar
- rice-water stool
- rice-water stools
- RICF
- Rich
- Richards
- Richards-Rundle syndrome
- Richards-Rundle syndrome
- Richardson
- Richet aneurysm
- Richet aneurysm
- Richmond crown
- Richner-Hanhart syndrome
- Richner-Hanhart syndrome
- Richter
- Richter hernia