| MR | Maddox rods; magnetic resistance; magnetic resonance; mandibular reflex; mannose-resistant; may repe... |
|---|---|
| MRA | magnetic resonance angiography; main renal artery; marrow repopulation activity; medical record anal... |
| MRI | machine-readable identifier; magnetic resonance imaging; medical records information; Medical Resear... |
| MRL | medical records librarian; Medical Research Laboratory |
| MSC | marrow stromal cell; Medical Service Corps; Medical Staff Corps |