| Abbreviation | Definition |
|---|---|
| MDR | multi-drug resistant |
| MDR | Multiple Disease Resistance |
| MDS | Movement Disorder Specialist |
| MDV | Marek Disease Virus |
| MDV | Multiple Dose Vial |
| ME | Medical Examiner |
| ME | Mental Efficiency |
| ME | Metabilizable Energy |
| ME | Metabolizable Energy |
| ME | Metaphysis and Epiphysis |
| ME | Mineral Efficiency |
| ME | My Eye |
| ME | Myalgic Encephalomyelitis |
| MED | Maximum Effective Dose |
| MED | Medial |
| MED | Minimal Erythemal Dose |
| MED | Minimum Effective Dose |
| MED | Minimum Erythemal Dose |
| MEDLARS | Medical Literature Analysis and Retreival System |
| MEDS | Medications |