| SRO | sex-ratio organism; single room occupancy; smallest region of overlap; Steele-Richardson-Olszewski [... |
|---|---|
| SRS | schizophrenic residual state; sex reassignment surgery; Silver-Russell syndrome; simple repeat seque... |
| SSBG | sex steroid-binding globulin; social services block grant |
| Sxs | serological sex-specific [antigen] |
| XO | presence of only one sex chromosome; xanthine oxidase |