| Meg-CSA | megakaryocyte colony-stimulating activity |
|---|---|
| MGSA | malignant growth stimulatory activity |
| MRA | magnetic resonance angiography; main renal artery; marrow repopulation activity; medical record anal... |
| MTA | malignant teratoma, anaplastic; medical technical assistant; medical technology assessment; metatars... |
| MUA | manipulation under anesthesia; middle uterine artery; motor unit activity |