| S | Greek capital letter sigma; syphilis; summation of series |
|---|---|
| SS | disulfide; sacrosciatic; saline soak; saline solution; saliva sample; saliva substitute; Salmonella-... |
| TEC | total electron count; total eosinophil count; total exchange capacity; transient erythroblastopenia ... |
| UGIS | upper gastrointestinal series |