| Acronym | Meaning |
![](file.png) | OTC | Open Tubular Column |
![](file.png) | OTC | Organic Toxic Compound |
![](file.png) | OTCEC | Open Tubular Capillary Electrochromatography |
![](file.png) | OTDR | Optical Time Domain Reflectometry |
![](file.png) | OTE | Optically Transparent Electrode |
![](file.png) | OTE | Oxygen Transfer Efficiency (of Aeration Diffusers) |
![](file.png) | OTEC | Ocean Thermal Energy Conversion |
![](file.png) | OTEC | Open Tubular Electrochromatography |
![](file.png) | OTEQ | One-dimensional Transport With Equilibria Calculations |
![](file.png) | OTFT | Organic Thin-film Transistor |
![](file.png) | OTIS | Oklahoma Telecommunications Interlibrary System |
![](file.png) | OTIS | One-dimensional Transport With Inflow And Storage |
![](file.png) | OTLC | Open Tubular Liquid Chromatography |
![](file.png) | OTS | Office Of Toxic Substances (USEPA) |
![](file.png) | OTTLE | Optically Transparent Thin-layer Electrode |
![](file.png) | OU | Odor Units |
![](file.png) | OUR | Oxygen Uptake Or Utilization Rate |
![](file.png) | OUST | Office Of Underground Storage Tanks |
![](file.png) | OVB | Orthogonalized Valence Bond Method |
![](file.png) | OVC | Optimized Valence Configuration |
![](file.png) | OVD | Optically Variable Device |
![](file.png) | OVD | Outside Vapor Deposition |
![](file.png) | OVFF | Orbital Valence Force Field |
![](file.png) | OVGF | Outer-valence Green Function (for Ionization-energy Calcns.) |
![](file.png) | OVMO | Occupied Valence-type Mol. Orbital |
![](file.png) | OVOC | Other Volatile Organic Compound |
![](file.png) | OVOS | Optimized Virtual Orbital Space Approximation (for Correlated Calcns.) |
![](file.png) | OW | Office Of Water |
![](file.png) | OWEC | Office Of Wastewater Enforcement And Compliance |
![](file.png) | OWG | Optical Waveguide |
![](file.png) | OWLS | Optical Waveguide Lightmode Spectroscopy |
![](file.png) | OWOW | Office Of Wetlands |
![](file.png) | OWPE | Office Waste Programs Enforcement |
![](file.png) | OWRS | Office Water Regulations And Standards (US EPA) |
![](file.png) | OWVP | Outgoing Wave Variational Principle |
![](file.png) | OZIPM | Ozone Isopleth Plotting With Optional Mechanisms |
![](file.png) | P-A TEST | Presence-absence Test |
![](file.png) | P-T-T-D | Pressure-temperature-time-deformation Path (for Metamorphic Rocks) |
![](file.png) | PA | Photoinduced Absorption |
![](file.png) | PA | Preliminary Assessment |
![](file.png) | PA-FTIR | Photoacoustic Fourier Transform Infrared Spectroscopy |
![](file.png) | PA/SI | Preliminary Assessment/Site Inspection |
![](file.png) | PAA | Photon Activation Analysis |
![](file.png) | PAA | Poly (acrylic Acid) |
![](file.png) | PAAP | Platelet Aggregation-associated Protein |
![](file.png) | PAB | Pollutant Assessment Branch (US EPA) |
![](file.png) | PAB | Particle Associated Bacteria |
![](file.png) | PAB | Passenger-side Air Bag |
![](file.png) | PABA | P-aminobenzoic Acid |
![](file.png) | PAC | P1-derived Artificial Chromosome |