| NAF | nafcillin; National Amputation Foundation; National Ataxia Foundation; net acid flux |
|---|---|
| NAS-NRC | National Academy of Science-National Research Council |
| NCD | National Commission on Diabetes; National Council on Drugs; neurocirculatory dystonia; nitrogen clea... |
| NCTC | National Cancer Tissue Culture; National Collection of Type Cultures |
| NDC | National Data Communications; National Drug Code; Naval Dental Clinic; nondifferentiated cell |