| Term | Definition / Meaning / Stand for |
| FAM |
6-Carboxyfluorescein (fluorescent dye) |
| FMOC |
9-Fluorenylmethyloxycarbonyl (protecting group in peptide synthesis) |
| FRL |
Far Red Light |
| FPP |
Farnesyl Diphosphate |
| FPP |
Farnesyl Pyrophosphate |
| FAB |
Fast Atom Bombardment |
| FFR |
Fast Fourier Reconstruction |
| FMR |
Fast Membrane Recovery |
| FMR |
Fast Metabolic Rate |
| FA |
Fatty Acid |
| FES |
Feline Endogenous Sarcoma |
| FES |
Feline Sarcoma Virus |
| FEO |
Ferro-Oxygen |
| FEO |
Ferrous Oxide |
| FPC |
Fibrinopeptide Cyclase |
| FPS |
Fibrinopeptide Sequence |
| FR |
Flame Retardant |
| FADH2 |
Flavin Adenine Dinucleotide Reduced |
| FDA |
Flavin Dehydrogenase Activity |
| FMN |
Flavin Mononucleotide |
| FRD |
Flavin Reductase |
| FAF |
Fluorescence Anisotropy Fluorimetry |
| FM |
Fluorescence Microscopy |
| FP |
Fluorescence Polarization |
| FQ |
Fluorescence Quantum Yield |
| FSEC |
Fluorescence Size-Exclusion Chromatography |
| FFI |
Fluorescent Fragment Isolation |
| FMP |
Fluorescent Magnetic Particle |
| FMP |
Fluorescent Magnetic Particles |
| FMC |
Fluorescent Microsphere Counting |
| FPI |
Fluorescent Polarization Imaging |
| FPE |
Fluorinated Polyethylene |
| FAP |
Fluorophore Assisted Photobleaching |
| FAF |
Fluorophore-Assisted Fragmentation |
| FUG |
Fluorouracil |
| FC |
Fold Change |
| FNB |
Formaldehyde Nitrogenous Base |
| FBD |
Formaldehyde-Based Detergent |
| FO |
Formaldehyde |
| FNT |
Formamide Nucleoside Transporter |
| FDH |
Formate Dehydrogenase |
| FCD |
Formyl Coenzyme A Dehydrogenase |
| FFS |
Formyl Furosemide Synthase |
| FSP |
Fractional Synthetic Rate |
| Ff |
Fragment Format |
| Fv |
Fragment Variable |
| FFA |
Free Fatty Acids |
| FVB |
Friend Virus B Strain |
| FOS |
Fructooligosaccharides |
| FBA |
Fructose Bisphosphate Aldolase |
| FNB |
Fructose Nitrogen Base |
| FMP |
Fructose-1-Phosphate |
| FPU |
Fucose Phosphorylase Unit |
| FG |
Functional Group |
| FUR |
Furfural |
| FeS |
Iron-Sulfur Cluster |
| Fv |
Variable Fragment (of an antibody) |
| FCC |
Face-Centered Cubic |
| FAP |
Familial Adenomatous Polyposis |
| FXR |
Farnesoid X Receptor |
| FPLC |
Fast Protein Liquid Chromatography |
| FPG |
Fasting Plasma Glucose |
| FOG |
Fat, Oil, and Grease |
| FAEE |
Fatty Acid Ethyl Esters |
| FAME |
Fatty Acid Methyl Ester |
| FAO |
Fatty Acid Oxidation |
| FAS |
Fatty Acid Synthase |
| FNR |
Ferredoxin-NADP Reductase |
| FTL |
Ferritin Light Chain |
| FBS |
Fetal Bovine Serum |