| MBL | Marine Biological Laboratory; menstrual blood loss; minimum bactericidal level |
|---|---|
| MCCD | minimum cumulative cardiotoxic dose |
| MCID | minimum clinically important difference |
| MCM | methylmalonic coenzyme A mutase; minimum capacitation medium |
| MD | Doctor of Medicine [Lat. Medicinae Doctor]; magnesium deficiency; main duct; maintenance dose; major... |