| Acronym | Meaning |
| HED | Howardite-eucrite-diogenite (suite Of Achondrite Meteorites) |
| FET | Field Effect Transistor |
| NLAP | Nonlimited Aeration Process (for Waste Treatment) |
| SFF | Solid Freeform Fabrication |
| END | Electron Nuclear Dynamics (method In Atomic And Molecular Scattering Calcns.) |
| OPC | Optical Particle Counter |
| AKD | Alkyl Ketene Dimer |
| AOES | Actinometry Optical Emission Spectroscopy |
| RILS | Regulatory Interpretation Letters |
| WSM | Watershed Model |