| Acronym | Meaning |
 | FD | Forced Draft |
| FD | Field Desorption |
| FDA | Food And Drug Administration |
| FDBVM | Finite Difference Boundary Value Method |
| FDCD | Fluorescence Detected Circular Dichroism |
| FDDI | Fiber-Distributed Data Interface |
| FDM | Field Desorption Microscopy |
| FDM | Finite-difference Method |
| FDMR | Fluorescence Detected Magnetic Resonance |
| FDMS | Field-desorption Mass Spectrometry |
| FDPM | Frequency-domain Photon Migration |
| FDR | Frequency Domain Reflectometry |
| FDS | Field Desorption Spectrometry |
| FDSO | Full Diagonal Second-order (approxn. To)-green Function |
| FDTD | Finite-difference Time-domain |
| FE | Fugitive Emissions |
| FEA | Field Emitter Array |
| FEA | Finite-element Analysis |
| FEBD | Fluid Extraction Biological Degradation Process For Organic Wastes |
| FEBIAD | Forced Electron Beam Induced Arc Discharge |
| FEBO | Free Energy Born-Oppenheimer |
| FECAP | Ferroelectric Capacitor |
| FECO | Fringes Of Equal Chromatic Order |
| FECS | Federation Of European Chemical Societies |
| FED | Field Emission Display |
| FEE | Field Electron Energy |
| FEED | Field Emission Energy Distribution |
| FEEM | Field Electron Emission Microscopy |
| FEEO | Fuel Efficient Engine Operation |
| FEES | Field Electron Energy Spectroscopy |
| FEESP | Field-emitted Electron Spin-polarization |
| FEF | Forced Expiratory Flow (lung Function) |
| FEFA | Fiber-optic Evanescent Field Absorption |
| FEFF | Free Energy Force Field |
| FEG | Field Emission Gun |
| FEGE | Free Electron Gas Exchange Approximation |
| FEGO | Floating Ellipsoidal Gaussian Orbital |
| FEI | Fire And Explosion Index |
| FEIS | Final Environmental Impact Statement |
| FEL | Fixed Emission Limit |
| FEL | Free Electron Laser |
| FELIX | Free Electron Laser For Infrared Experiments |
| FELV | Feline Leukemia Virus |
| FEM | Field-Electron Microscopy |
| FEM | Finite Element Method |
| FEM | Field Emission Microscopy |
| FEM | Free Electron Model |
| FEMA | Federal Emergency Management Agency |
| FEMA | Flavor Extract Manufacturers Association |
| FEMO | Free-electron Molecular Orbital |
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