| OS | left eye [Lat. oculus sinister]; occipitosacral; occupational safety; office surgery; Omenn syndrome... |
|---|---|
| PRAISE | Prospective Randomized Amlodipine Survival Evaluation |
| PST | pancreatic suppression test; paroxysmal supraventricular tachycardia; penicillin, streptomycin, and ... |
| RFS | relapse-free survival; renal function study; rotating frame spectroscopy |
| RSR | regular sinus rhythm; relative survival rate; right superior rectus [muscle] |