| MR | Maddox rods; magnetic resistance; magnetic resonance; mandibular reflex; mannose-resistant; may repe... |
|---|---|
| MRVP | mean right ventricular pressure; methyl red, Voges-Proskauer [medium] |
| NR | do not repeat [Lat. non repetatur]; nerve root; neural retina; neutral red; noise reduction; nonreac... |
| NRbc | nucleated red blood cell |
| NRU | neutral red uptake |