| Abbreviation | Definition |
|---|---|
| FQI | Flouristic Quality Indicator |
| Fr | Francium |
| FR | Free Radical |
| FRAP | Fluorescence Recovery After Photobleaching |
| FRAP | Fluoride-Resistant Acid Phosphatase |
| FRAPPE | Front Range Air Pollution and Photochemistry Experiment |
| FROG | Fresh Reservoir Oxygen Generator |
| FRS | Free Radical Scavenger |
| FRSC | Fellow of the Royal Society of Chemistry |
| FRSC | Fellowship of the Royal Society of Chemistry |
| FRSR | Free Radical Substitution Reaction |
| FS | Free State |
| FSA | Formamidine Sulphinic Acid |
| FSD | Fractional Systamatic Distillation |
| FSI | Final State Interactions |
| FSS | Full Substitution Saturation |
| FSTBA | Fasting Serum Total Bile Acid |
| FSTG | Formulation Science and Technology Group |
| FTIR | Fast Temperature Input Radiation |
| FTM | Fluid Thioglycolate Medium |