NA

• Avogadro constant or number;

• nalidixic acid;

• Narcotics Anonymous;

• network administrator;

• neuraminidase;

• neurologic age;

• neutralizing antibody;

• neutrophil antibody;

• nicotinic acid;

• Nomina Anatomica;

• non-A [hepatitis virus];

• nonadherent;

• nor-adrenalin;

• not admitted;

• not applicable;

• not available;

• nuclear antibody;

• nucleic acid;

• nucleoside analogue;

• nucleus ambiguus;

• numerical aperture;

• nurse's aide;

• nursing assistant;

• nursing auxiliary