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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
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NA abbr
1) Nomina Anatomica
2) numerical aperture
3) nurse's aide
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Avogadro's number.Medical dictionary. 2011.