| FMS | fat-mobilizing substance; Fellow of the Medical Society; fibromyalgia syndrome; full mouth series |
|---|---|
| FRS | Fellow of the Royal Society; ferredoxin-reducing substance; first rank symptom; furosemide |
| GSS | gamete-shedding substance; General Social Survey; Gerstmann-Straussler-Scheinker [disease] |
| IAS | immunosuppressive acidic substance; infant apnea syndrome; insulin autoimmune syndrome; interatrial ... |
| IFGS | interstitial fluid and ground substance |