| Abbreviation | Definition |
|---|---|
| RNX | Respiratory Neuron Homeodomain Protein |
| ROS | Return of Old Symptom |
| RPE | Rate of Percieved Exertion |
| RPF | Renal Plasma Flow |
| RPL | Radiochemical Processing Laboratory |
| RPL | Rapid Prototyping Laboratory |
| RPL | Rocket Propulsion Laboratory |
| RPMI | Roswell Park Memorial Institute |
| RPR | Rapid Plasma Reagin test |
| RQF | Rodent Quarantine Facility |
| RR | relative risk |
| RRA | Radioreceptor assay |
| RRBS | reduced representation bisulfite sequencing |
| RRC | Rehabilitation Research Center |
| RRD | Recurrence Rate Data |
| RRDC | Research and Rehabilitation Development Center |
| RRE | Rev Responsive Element |
| RRL | Radio Research Laboratory |
| RRL | Reconfigurable Robotics Laboratory |
| RRL | Resuscitation Research Laboratory |