| NA | Avogadro constant or number; nalidixic acid; Narcotics Anonymous; network administrator; neuraminida... |
|---|---|
| NM | near-miss; neomycin; neuromedin; neuromuscular; neutrophil migration; nictitating membrane; nitrogen... |
| ACN | acute conditioned neurosis; Ambulatory Care Network; American College of Neuropsychiatrists; America... |
| ANN | artificial neural network |
| ARPANET | Advanced Research Projects Agency Network |