| Acronym | Meaning |
| HCD | Hollow Cathode Discharge |
| HAN | Halogenated Acetonitrile(s) |
| EDRF | Endothelium-derived Relaxing Factor |
| HFWG | Hollow Fiber Waveguide |
| CENSA | Collaborative Electronic Notebook Systems Association |
| NRT | National Response Team |
| MSIS | Mass Spectrometer And Incoherent Scatter |
| PCEM | Point-charge Electrostatic Model |
| MTAB | Myristyltrimethylammonium Bromide (surfactant) |
| HDD | Halogenated Dibenzodioxin(s) |