| Abbreviation | Definition |
|---|---|
| MCSL | Munsell Color Science Laboratory |
| MCT | Medium Chain Triglyceride |
| MCV | Mean Corpuscular Volume |
| MCWL | Marine Corps Warfighting Laboratory |
| MD | Malate Dehydrogenase |
| MD | Male treated with Deoxycorticosterone |
| MD | Medium Dosage |
| MD | MethylDopa |
| MD | Minimum Dosage |
| MDBL | Multi Disciplinary Bioengineering Laboratory |
| MDCK | Madin-Darby canine kidney cells |
| MDF | Massively Damp Fungus |
| MDHD | Maximum Daily Human Dose |
| MDL | Medical Diagnostic Laboratories |
| MDL | Meteorological Development Laboratory |
| MDL | Microbial Diseases Laboratory |
| MDL | Microwave Development Laboratories |
| MDL | Molecular Diagnostic Laboratories |
| MDMA | Magically Do More Acid |
| MDML | Machining Dynamics and Mechanics Laboratory |