| Mal | malate; malfunction; malignancy |
|---|---|
| MD | Doctor of Medicine [Lat. Medicinae Doctor]; magnesium deficiency; main duct; maintenance dose; major... |
| MDH | malate dehydrogenase; medullary dorsal horn |
| ALAS | delta-aminolevulinate synthase |
| ALASH | delta-aminolevulinate synthase, housekeeping type |