| Acronym | Meaning |
 | ESTEC | European Space Research And Technology Centre |
| ESTEMI | Energy Selected Transmission Electron Microscopy Imaging |
| ESTN | Electron Spin Transient Nutation |
| ESW | Electroslag Welding |
| ESW | Equivalent Slab Waveguide |
| ESWL | Extracorporeal Shockwave Lithotripsy |
| ESWTR | Enhanced Surface Water Treatment Rule |
| ETA | Electrothermal Atomization |
| ETA | Eigenstructure Tracking Analysis |
| ETA | Emanation Thermal Analysis |
| ETAAS | Electrothermal Atomic Absorption Spectrometry |
| ETAD | Ecological And Toxicological Association Of Dye And Organic Pigment Manufacturers |
| ETANN | Electronically Trainable Analog Neural Network |
| ETB | Extended Tight-binding (method For Electronic-structure Calcns.) |
| ETBE | Ethyl Tert Butyl Ether |
| ETBM | Empirical Tight-binding Method (in Electronic Structure Calcn.) |
| ETD | Enhanced Trickle Down (watershed Acidification Model) |
| ETEAO | Even-tempered Exponential Atomic Orbital |
| ETEC | Environmental Technology & Education Center |
| ETEC | Enterotoxigenic Escherichia Coli |
| ETEX | European Tracer Experiment |
| ETF | Exponential-type Function (an Ao) |
| ETF | Extended Thomas-Fermi (model) |
| ETFSI | Extended Thomas-Fermi Strutinski Integral |
| ETGAO | Even-tempered Gaussian Atomic Orbital |
| ETI | Environmental Testing Industry |
| ETIC | Environmental Teratology Information Center |
| ETL | Electron Transport Layer |
| ETO | Elliptical-type Orbital |
| ETO | Exponential-type Orbital |
| ETP | Emerging Technology Program (USEPA SITE) |
| ETP | Electron-transfer Polymer |
| ETP | Environmental Tracking Procedure |
| ETS | EPCRA 313 Tracking System |
| ETS | Electron Transmission Spectroscopy |
| ETS | Electron Transport System |
| ETS | Environmental Tobacco Smoke |
| ETS | Extended Transition State (method For Bond Dissocn. Energies) |
| ETS | External Transcribed Spacer |
| ETSAP | Energy Technology Systems Analysis Program |
| ETU | Ethylene Thiourea (carcinogen |
| ETV | Electrothermal Vaporization |
| EU | European Union |
| EU | Enzyme Unit |
| EU | Exposure Unit |
| EUMAC | European Modeling Of Atmospheric Constituents |
| EUROTRAC | European Experiment Of Transport And Transformation Of Environmentally Relevant Trace Constituents In The Troposphere Over Eur |
| EUSES | European Union System For Evaluation Of Substances |
| EUSIDIC | European Society For Information Dissemination In Chemistry |
| EUSO | Extreme Universe Space Observatory |
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