| Acronym | Meaning |
 | ELAP | Environmental Laboratory Accreditation Program |
| ELARP | Experimental Lakes Area Reservoir Project |
| ELAS | Electro Acoustic Spectrometry |
| ELCAD | Electrolyte-cathode Discharge |
| ELCD | Electrolytic Conductivity Detection |
| ELDOR | Electron Double Resonance |
| ELED | Edge-emitting Light Emitting Diode |
| ELEED | Elastic Low Energy Electron Diffraction |
| ELEPS | Extended London-Eyring-Polyani-Sato (potential Energy Surface) |
| ELF | Electron Localization Function |
| ELF | Environmental Load Factor |
| ELF | Extremely Low Frequency |
| ELFFS | Excimer Laser Fragmentation-fluorescence Spectroscopy |
| ELFSE | End-labeled Free-solution Electrophoresis |
| ELG | Emission-line Galaxy |
| ELH | Egg-laying Hormone |
| ELI | Extra Low Interstitial |
| ELIF | Excimer Laser Induced Fragmentationpar |
| ELIFA | Enzyme-linked Immunofiltration Assay |
| ELINCS | European List Of Notified Chemical Substances |
| ELISA | Enzyme Linked Immunosorbent Assay |
| ELKM | Extended Lumped Kinetic Model |
| ELLAP | Environmental Lead Laboratory Accreditation Program |
| ELLPAT | Environmental Lead Laboratory Proficiency Analytical Testing |
| ELLSA | Enzyme Linked Ligand Sorbent Assay |
| ELM | Emulsion Liquid Membranes |
| ELMF | European Large Magnetic Field Facility |
| ELMO | Energy-localized Molecular Orbital |
| ELN | Electronic Laboratory Notebook |
| ELNES | Electron Energy-loss Near Edge Structure |
| ELO | Edge Localized Orbital |
| ELO | Epitaxial Lateral Overgrowth |
| ELO | Equivalent Localized Orbitals |
| ELOG | Epitaxial Lateral Overgrowth |
| ELP | Elastin-like Polypeptide |
| ELPAT | Environmental Lead Proficiency Analytical Testing |
| ELRA | Enzyme-linked Receptor Assay |
| ELS | Energy Loss Spectroscopy |
| ELSA | Electron Stretcher Accelerator |
| ELSA | Emergency Level Scale Assessment |
| ELSD | Evaporative Light Scattering Detector |
| ELV | End-of-life Vehicle |
| EM | Enriched Mantle |
| EM | Electron Microscopy |
| EMA | Effective Mass Approxn. (for Impurity Energy Levels) |
| EMA | Effective Medium Approximation |
| EMA | Electron Microprobe Analysis |
| EMA | Ethylene Methyl Acrylate |
| EMAG | Electron Microscopy And Analysis Group |
| EMAIL | Electronic Mail |
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