| SpS | sphenoid sinus |
|---|---|
| SR | sarcoplasmic reticulum; saturation recovery; scanning radiometer; screen; secretion rate; sedimentat... |
| SRT | sedimentation rate test; simple reaction time; sinus node recovery time; sitting root test; speech r... |
| SSST | superior sagittal sinus thrombosis |
| SSSV | superior sagittal sinus velocity |