| NSMR | National Society for Medical Research |
|---|---|
| BNIST | National Bureau of Scientific Information [Fr. Bureau National d'Information Scientifique] |
| NAF | nafcillin; National Amputation Foundation; National Ataxia Foundation; net acid flux |
| NAPH | naphthyl; National Association of Public Hospitals; National Asthma Education Program; nicotinamide ... |
| NAS | nasal; National Academy of Sciences; National Association of Sanitarians; neonatal airleak syndrome;... |