| NA | Avogadro constant or number; nalidixic acid; Narcotics Anonymous; network administrator; neuraminida... |
|---|---|
| NIC | National Informatics Center; neurogenic intermittent claudication; neurointensive care; nursing inte... |
| NS | natural science; Neosporin; nephrosclerosis; nephrotic syndrome; nervous system; neurological surger... |
| SAL | sensorineural activity level; sterility assurance level; suction-assisted lipectomy |
| CEQ | Council on Environmental Quality |