| Acronym | Meaning |
| PHDD | Polyhalogenated Dibenzodioxin(s) |
| OHER | Office Of Health And Environmental Research (US Dept. Of Energy) |
| VHSIC | Very High Speed Integrated Circuit |
| MP2-R12 | MP2 Theory With Terms Linear In Interelectronic Distance (r12) |
| CCE | Counterflow Centrifugal Elutriation |
| OEP | Odd-even (alkane/carbon) Predominance (geology) |
| USTR | US Transuranium Registry |
| PSP | Pancreatic Stone Protein |
| LINF | Laser-induced Native Fluorescence |
| UHF | Unrestricted Hartree-Fock |