| MHN | massive hepatic necrosis; Mohs hardness number; morbus hemolyticus neonatorum |
|---|---|
| mn | modal number |
| MNL | marked neutrophilic leukocytosis; maximum number of lamellae; mononuclear leukocyte |
| MPN | most probable number |
| NA | Avogadro constant or number; nalidixic acid; Narcotics Anonymous; network administrator; neuraminida... |