| Acronym | Meaning |
 | EHSO | Environmental Health And Safety Online |
| NAPBN | National Air Pollution Background Network |
| SXNO | Singly Excited Natural Orbital |
| DCB | Double-cantilever Beam |
| BRET | Breeder Reprocessing Engineering Test |
| PNDO | Partial Neglect Of Differential Overlap |
| GERD | Gastroesophageal Reflux Disease |
| CCOSM | Chemistry And Circulation Occultation Spectroscopy Mission |
| EMSL | Environmental Monitoring Systems Laboratory |
| QCA | Quasichemical Approxn. (in Calcns. On Semiconductors) |
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