| Acronym | Meaning |
 | PRTD | Proportional Residence Time Distribution (of Liquid Streams In Equalization Basins In WWT) |
| BERM | Biological And Environmental Reference Materials |
| TOVS | TIROS Operational Vertical Sounder |
| IUE | International Ultraviolet Explorer |
| PSA | Pressure Sensitive Adhesive |
| CSI | Chemical Substances Inventory |
| EC | Enzyme Commission |
| NDB | Nondefective Bonding |
| WMO | World Meteorological Organization |
| CTC | Charge-transfer Complex |
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