| NCTC | National Cancer Tissue Culture; National Collection of Type Cultures |
|---|---|
| NDC | National Data Communications; National Drug Code; Naval Dental Clinic; nondifferentiated cell |
| NII | National Information Infrastructure; National Insurance Institute |
| NMA | National Malaria Association; National Medical Association; neurogenic muscular atrophy; N-nitroso-N... |
| NMF | N-methylformamide; National Medical Fellowship; National Migraine Foundation; nonmigrating fraction |