| S/N | signal/noise [ratio] |
|---|---|
| SNR | selective nerve root [block]; signal-to-noise ratio; substantia nigra zona reticulata; supernumerary... |
| SRP | short rib-polydactyly [syndrome]; signal recognition particle; Society for Radiological Protection; ... |
| SRPR | signal recognition particle receptor |
| STAT | immediately (Lat. statim); signal transducer and activator of transcription |