| Abbreviation | Definition |
|---|---|
| NUANT | Normal Uric Acid No Thanks |
| NV | Non-Volatile |
| NV | Valence Number |
| NVC | Non- Volatile Chemical |
| NVOC | Non-Volatile Organic Chemical |
| NVV | Non- Volatile Volume |
| NX | Next Xperiment |
| O | Odor |
| O | Oxygen |
| O/W | Oil-in-water |
| OA | organic aerosol |
| OAA | Oxalo Acetic Acid |
| OAA | OxAloAcetate |
| OAAD | Ovarian Ascorbic Acid Depletion |
| OAET | Oesophageal Acid Exposure Time |
| OAM | Orbital Angular Momentum |
| OAS | Optimum Additive Solution |
| OAT | Organic Acid Technology |
| OATS | Olefin Alkylation of Thiophenic Sulfur |
| OB | Oligosaccharide Binding |