| Acronym | Meaning |
| MDI | Methylene Di-p-phenylene Isocyanate |
| IRF | Instrument Response Function |
| NHRL | Northern Hemisphere Reference Line |
| SNARL | Suggested No-adverse Response Level |
| ISC | Intersystem Crossing |
| SRF | Serum Response Factor |
| GREAT-ER | Geog.-referenced Regional Exposure Assessment Tools For European Rivers |
| SSRI | Selective Serotonin Reuptake Inhibitor |
| BHT | Bottom-hole Temperature |
| FLMTO | Film Linearized Muffin-tin Orbital (for Surface Electronic Structure Calcns.) |