| NA | Avogadro constant or number; nalidixic acid; Narcotics Anonymous; network administrator; neuraminida... |
|---|---|
| NARC | narcotic; National Association for Retarded Children; nucleus arcuatus |
| NGC | nucleus reticularis gigantocellularis |
| NI | neuraminidase inhibition; neurological improvement; neutralization index; no information; noise inde... |
| NLT | normal lymphocyte transfer; not less than; nucleus lateralis tuberis |