| Abbreviation | Definition |
|---|---|
| ST | Stomach |
| STAG | Split-Thickness AutoGraft |
| STAP | System For Training Of Aphasia Patients |
| STAPH | Staphylococcus |
| STAR | Specialised Trauma Air Response |
| STAR | Steps Towards Allergy Relief |
| STAR | Strategic and Tactical Axiomatic Response |
| STARFISH | Supportive Training And Recovery For Individual Stammerer's Harmony |
| START | Simple Triage And Rapid Transport |
| START | Subject Timed Age Regression Therapy |
| STAT | Immediately |
| STAT | Immediately, At Once |
| STAT | Signal Transducer and Activator of Transcription |
| STBM | Seminiferous Tubule Basement Membrane |
| STD | Sexual Tension Disorder |
| STD | Sexually Transmitted Disease |
| STD | Short-Term Depression |
| STD | Skin Test Dose |
| STD | Small Testicle Disorder |
| STD | Standard |