| Acronym | Meaning |
| NBO | Natural Bond Order |
| PROC | Photochemically Reactive Organic Compound(s) |
| PRA | Plasma Renin Activity |
| SXRAM | Scanning X-ray Analytical Microprobe |
| XHV | Extremely High Vacuum |
| A/C | Activated Carbon |
| BRSV | Bovine Respiratory Syncytial Virus |
| CCL | Drinking Water Contaminant Candidate List |
| WLF | Williams-Ferry-Landel [viscosity Math. Relation/parameter] |
| WQS | Water Quality Standard |