| Acronym | Meaning |
| PCMT | Protein Carboxyl Methyltransferase |
| TAD | Thermophilic Aerobic Digestion (of Sewage Sludge) |
| GBS | Group B Streptococci |
| MAOI | Monoamine Oxidase Inhibitor |
| RCP | Reciprocal Calcn. Procedure [of ACGIH] |
| CCR | Conradson Carbon Residue |
| UMDE | Ultramicrodisk Electrode |
| SOP/EA | Split-operator Propagator (for) Electronically Adiabatic (phenomena) |
| HHMI | Howard Hughes Medical Institute |
| APSA | Advanced Photovoltaic Solar Array |