| Acronym | Meaning |
| PDU | Process Development Unit |
| PERL | Passivated Emitter And Rear Locally Diffused (solar Cells) |
| THESEO | Third European Stratospheric Experiment On Ozone |
| WAD | Weak And Dissociable Or Weak Acid Dissociable |
| BPH | Benign Prostatic Hyperplasia |
| EPC | Evaporative Pattern Casting |
| LPA | Linearized Propagator Approximation |
| QHA | Quasi-harmonic Approxn. (in Intramol. Vibrational Relaxation) |
| OAW | Oxyacetylene Welding |
| ISEC | Inverse Size-exclusion Chromatography |