| Abbreviation | Definition |
|---|---|
| NVP | N-vinyl pyrrolidone |
| NWLsector | North West London sector |
| NwSI | nurse with special interest |
| NWTFS | North West Thames Foundation School |
| NWW | Abbreviation for: NHS Wide Web |
| NYCDoHMH | New York City Department of Health and Mental Hygiene (!) |
| OA | obstructive apnoea |
| OA | occipital artery |
| OA | occiput anterior |
| OA | odontoameloblastoma |
| OA | oesophageal atresia |
| OA | oleic acid |
| OA | oligoastrocytoma |
| OA | open appointment |
| OA | ophthalmic artery |
| OA | option appraisal |
| OA | organic anion |
| OA | orotic acid |
| OA | ovarian artery |
| OA | oxalic acid |