| LIRBM | liver, iron, red bone marrow |
|---|---|
| MERRF | myoclonus epilepsy with ragged red fibers [syndrome] |
| MERRLA | myoclonus epilepsy-ragged red fibers-lactic acidosis [syndrome] |
| MR | Maddox rods; magnetic resistance; magnetic resonance; mandibular reflex; mannose-resistant; may repe... |
| MRVP | mean right ventricular pressure; methyl red, Voges-Proskauer [medium] |