| MDSBP | mean daily supine blood pressure |
|---|---|
| MDTR | mean diameter-thickness ratio |
| MDV | Marek disease virus; mean dye [bolus] velocity; mucosal disease virus |
| MEF50 | mean maximal expiratory flow |
| MEP | maximum expiratory pressure; mean effective pressure; mepiridine; mitochondrial encephalopathy; moto... |