| Acronym | Meaning |
| ETO | Elliptical-type Orbital |
| NCPTT | National Center For Preservation Technology And Training |
| PTD | Probable Toxic Dose |
| GWTR | Ground Water Treatment Rule |
| SDIM | Scaled Diatomics-in-molecules |
| APCVD | Atm.-pressure Chem. Vapor Deposition |
| HATR | Horizontal Attenuated Total Reflection |
| TRDS | Text Retrieval Data System |
| RSMR | Rayleigh Scattering Of Moessbauer Radiation |
| MACSP | Marine Analytical Chemistry Standards Program |