睡前的：属于或发生于睡前期的- rimula
- rinderpest
- Rindfleisch's cells, folds
- ring
- ring-bone
- Ringer's injection, irrigation
- ringworm
- Rinne's test
- Riolan's anastomosis, arch,etc
- Riopan
- Ripault's sign
- ripazepam
- risk
- Risley's prism
- risocaine
- RIST
- Ristella melaninogenica
- ristocetin
- risus
- Ritalin
- Ritgen maneuver (method)
- ritodrine
- Ritter-Rollet phenomenon(sign)
- Ritter's disease
- Ritter-Valli law