| N/2 | half-normal [solution] |
|---|---|
| N/10 | tenth-normal [solution] |
| N/50 | fiftieth-normal [solution] |
| NAD | neutrophil actin dysfunction; new antigenic determinant; nicotinamide adenine dinucleotide; nicotini... |
| NBME | National Board of Medical Examiners; normal bone marrow extract |