| RAS | 1) Reticular Activating(Activation) System 2) Renal Artery Stenosis |
|---|---|
| RES | Reticulo-Endothelial System |
| SI | System of International Units (Systeme International D'unites) |
| AAMRS | automated ambulatory medical record system |
| ABO | abortion; absent bed occupancy; American Board of Orthodontists; blood group system consisting of gr... |