| Acronym | Meaning |
| EHAP | Extremely Hazardous Air Pollutant |
| BIA | Bioelectric Impedance Analysis |
| PFPD | Pulsed-flame Photometer Detector |
| HDC | High Dose Chemotherapy |
| HSF | Hiller-Sucher-Feinberg (equation For Calcn. Of Spin Densities And Charge Densities In Mols.) |
| ISI | Institute For Scientific Information |
| ESI | Electrospray Ionization |
| UPW | Ultrapure Water |
| CASTNET | Clean Air Status And Trends Network |
| LVM-ST | Least-squares Variational Method (involving Only) Square-integrable (test Functions) (for Wave Functions In Scattering) |