| TSB | total serum bilirubin; trypticase soy broth; tryptone soy broth |
|---|---|
| ORS | olfactory reference syndrome; oral rehydration solution; oral surgery, oral surgeon; Orthopaedic Res... |
| SDU | standard deviation unit; step-down unit |
| STEP | Sequential Test of Educational Programs |
| 'Greek letter alpha' | angular acceleration; first [carbon atom next to the carbon atom bearing the active group in organic... |