| RS | radioscaphoid; random sample; rating schedule; Raynaud syndrome; recipient's serum; rectal sinus; re... |
|---|---|
| s2 | sample variance |
| SEM | sample evaluation method; scanning electron microscopy; secondary enrichment medium; standard error ... |
| S/H | sample and hold |
| SRU | sample ratio units; side rails up; solitary rectal ulcer; structural repeating unit |