| NR | do not repeat [Lat. non repetatur]; nerve root; neural retina; neutral red; noise reduction; nonreac... |
|---|---|
| NRSA | National Research Service Award [of NIH] |
| NTIS | National Technical Information Service |
| OBS | obesity; obstetrical service; organic brain syndrome |
| OHS | obesity hypoventilation syndrome; occipital Horn syndrome; occupational health service; ocular histo... |