| FRES | Fellow of the Royal Entomological Society |
|---|---|
| FRMedSoc | Fellow of the Royal Medical Society |
| FRMS | Fellow of the Royal Microscopical Society |
| FRS | Fellow of the Royal Society; ferredoxin-reducing substance; first rank symptom; furosemide |
| FRSH | Fellow of the Royal Society of Health |
| S.I.O.P. | Society of Paediatric Oncology |
|---|---|
| SIOP | Society of Pediatric Oncology |
| STS | Society of Thoracic Surgeons |