- religion
- Relistor
- REM sleep
- Remeron
- remission
- remission induction therapy
- remote brachytherapy
- renal artery
- renal capsule
- renal cell adenocarcinoma
- renal cell cancer
- renal cell carcinoma
- renal collecting tubule
- renal failure
- renal fascia
- renal function test
- renal glomerulus
- renal pelvis
- renal tubular acidosis
- Renova
- replicate
- replication cycle
- reporting delay
- reproductive cell
- reproductive system
- research base
- research study
- resectable
- resected
- resection
- resectoscope
- residual disease
- resin
- resiquimod
- resistant cancer
- resorption
- respirator
- respiratory syncytial virus
- respiratory system
- respiratory therapist
- respiratory therapy
- respiratory tract
- respite care
- response
- response rate
- resting
- restless legs syndrome
- resveratrol
- retch
- reticular dermis