| Abbreviation | Definition |
|---|---|
| SVT | SupraVentricular Tachycardia |
| SVZ | Sub- Ventricular Zone |
| SW | spike-and-wave |
| SW | Stab Wound |
| SW | SWollen |
| SWA | Swab |
| SWADS | South Wales Anxiety Depression Support |
| SWAN | Sleep Well At Night |
| SWAT | Straight White Attractive Teeth |
| SWAT | Stress, Worry, Anxiety, Tension |
| SWB | Subjective Well Being |
| SWC | Sleep-Wake Cycle |
| SWFI | Sterile Water For Injection |
| SWI | Salt Water Immersion |
| SX | Symptoms |
| SX | Syndrome X |
| SXD | Self-eXamining Device |
| SXF | Síndrome X Frágil |
| SXI | Severely Multiply Impaired |
| SXR | Soft X-Ray |