| Abbreviation | Definition |
|---|---|
| RID | Restless Irritable And Discontent |
| RID | Ruptured intervertebral disc |
| RIF | Reduced Injury Factor |
| RIF | Right Iliac Fossa |
| RIFLE | risk, injury, failure, loss, end-stage |
| RIJV | Right Internal Jugular Vein |
| RIMP | Rectal Internal Mucosal Prolapse |
| RIMS | Recirculated Infusion Mash System |
| RIND | Reversible Ischemic Neurologic Deficit |
| RIP | Respiratory Inductance Plethysmography |
| RIS | Resistance, Immunity, Susceptibility |
| RITA | Randomised Intervention Treatment Of Angina |
| RIVA | Ramus InterVentricularis Anterior (anterior interventricular branch of left coronary artery) |
| RIVD | Ruptured intervertebral disc |
| RJF | Rolling-Joint prosthetic Foot |
| RKN | Root- Knot Nematode |
| RL | Recall Level |
| RL | Right to Left |
| RLA | Really Large Arms |
| RLA | Residual Life Assessment |