| MDNB | mean daily nitrogen balance; metadinitrobenzene |
|---|---|
| MDSBP | mean daily supine blood pressure |
| MDT | mast [cell] degeneration test; mean dissolution time; median detection threshold; multidisciplinary ... |
| MDTR | mean diameter-thickness ratio |
| MDV | Marek disease virus; mean dye [bolus] velocity; mucosal disease virus |