| Acronym | Meaning |
 | ADP | Adenosine Diphosphate (RN 58-64-0) |
| WSI | Water Sediment Interface |
| CTM | Conditional Test Method |
| SMSO | Spinor Molecular Symmetry Orbital |
| ECEC | Effective Cation Exchange Capacity |
| MSS | Mobile Servicing Station [space Station] |
| LPA | Lipoprotein A |
| MWD | Molecular Weight Distribution |
| PSD | Pulse Shape Discrimination |
| BLR | Broad Line Region |
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