| Abbreviation | Definition |
|---|---|
| STD | Standing Tremor Disorder |
| STDD | Short Term Depression Detector |
| STEL | Short-term exposure limit |
| STEMI | ST-Segment Elevation Myocardial Infarction |
| STEPS | System For Thalidomide Education And Prescribing Safety |
| STH | Somatotropin |
| STI | Severe Thumb Injury |
| STI | Sexually Transmitted Infection |
| STI | Signal Transduction Inhibitor |
| STI | Soft Tissue Injury |
| STI | Structured Treatment Interruptions |
| STI | Systolic Time Interval |
| STIR | Short T Inversion Recovery |
| STL | Swelling, Tenderness, Limitation |
| STLOM | Swelling, tenderness, limitation of motion |
| STM | Short Term Memory |
| STM | Soft Tissue Management |
| STN | Solitary Thyroid Nodule |
| STN | Solitary Tract Nucleus |
| STN | Spinal Trigeminal Nucleus |