| MCAB | monoclonal antibody |
|---|---|
| MCG | magnetocardiogram; membrane coating granule; monoclonal gammopathy |
| MG | Marcus Gunn [pupil]; margin; medial gastrocnemius [muscle]; membranous glomerulonephritis; menopausa... |
| MGUS | monoclonal gammopathies of undetermined significance |
| Mo | Moloney [strain]; molybdenum; monoclonal |