| Abbreviation | Definition |
|---|---|
| ROESY | Rotational Overhauser Effect SpectroscopY |
| ROHS | Restriction Of Hazardous Substances |
| ROI | Radius Of Influence |
| ROIV | Remotely Operated Isolation Valve |
| ROS | Route Of Synthesis |
| ROS | Radical Oxygen Species |
| ROS | Rate Of Oxidation |
| ROS | Rate Of Sulfation |
| ROS | Reactive Oxygen Species |
| RPB | Release Prevention Barrier |
| RPCR | Realtime Polymerase Chain Reaction |
| RPR | Rapid Plasma Reagin |
| RQY | Relative Quantum Yield |
| RR | Rapid Rise |
| RRNA | Ribosomal ribo nucleic acid |
| RSA | Radical Scavenging Activity |
| RSC | Rotamer Side-Chain |
| RSD | Reactive Sputter Deposition |
| RSH | Range Separated Hybrid |
| RSPM | Respirable Suspended Particulate Matter |