| MRBF | mean renal blood flow |
|---|---|
| MREI | mean rate ejection index |
| MRP | mean resisting potential; medical reimbursement plan; multidrug resistance-associated protein |
| MRVP | mean right ventricular pressure; methyl red, Voges-Proskauer [medium] |
| MS | Maffuci syndrome; maladjustment score; mandibular series; Marfan syndrome; Marie-Strumpell [syndrome... |