| nc | nanocurie; not counted |
|---|---|
| NCD | National Commission on Diabetes; National Council on Drugs; neurocirculatory dystonia; nitrogen clea... |
| N/D | no defects; not done |
| NDAC | not data accepted |
| NEC | National Electrical Code; necrotizing enterocolitis; neuroendocrine cell; neuroendocrine convertase;... |